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From: Morten Brørup <mb@smartsharesystems.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"Olivier Matz" <olivier.matz@6wind.com>
Cc: "Slava Ovsiienko" <viacheslavo@nvidia.com>,
	"NBU-Contact-Thomas Monjalon" <thomas@monjalon.net>,
	<dev@dpdk.org>, <techboard@dpdk.org>,
	"Ajit Khaparde" <ajit.khaparde@broadcom.com>,
	"Andrew Rybchenko" <andrew.rybchenko@oktetlabs.ru>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	<david.marchand@redhat.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	<jerinj@marvell.com>, <honnappa.nagarahalli@arm.com>,
	<maxime.coquelin@redhat.com>, <stephen@networkplumber.org>,
	<hemant.agrawal@nxp.com>, "Matan Azrad" <matan@nvidia.com>,
	"Shahaf Shuler" <shahafs@nvidia.com>
Subject: Re: [dpdk-dev] [PATCH 15/15] mbuf: move pool pointer in hotterfirst half
Date: Thu, 5 Nov 2020 10:04:29 +0100
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35C613EC@smartserver.smartshare.dk> (raw)
In-Reply-To: <BYAPR11MB3301E6C03E11C4508064483C9AEE0@BYAPR11MB3301.namprd11.prod.outlook.com>

> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ananyev,
> Konstantin
> Sent: Thursday, November 5, 2020 1:26 AM
> 
> >
> > Hi,
> >
> > On Tue, Nov 03, 2020 at 04:03:46PM +0100, Morten Brørup wrote:
> > > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Slava
> Ovsiienko
> > > > Sent: Tuesday, November 3, 2020 3:03 PM
> > > >
> > > > Hi, Morten
> > > >
> > > > > From: Morten Brørup <mb@smartsharesystems.com>
> > > > > Sent: Tuesday, November 3, 2020 14:10
> > > > >
> > > > > > From: Thomas Monjalon [mailto:thomas@monjalon.net]
> > > > > > Sent: Monday, November 2, 2020 4:58 PM
> > > > > >
> > > > > > +Cc techboard
> > > > > >
> > > > > > We need benchmark numbers in order to take a decision.
> > > > > > Please all, prepare some arguments and numbers so we can
> discuss
> > > > the
> > > > > > mbuf layout in the next techboard meeting.
> >
> > I did some quick tests, and it appears to me that just moving the
> pool
> > pointer to the first cache line has not a significant impact.
> 
> Hmm, as I remember Thomas mentioned about 5%+ improvement
> with that change. Though I suppose a lot depends from actual test-case.
> Would be good to know when it does help and when it doesn't.
> 
> >
> > However, I agree with Morten that there is some room for optimization
> > around m->pool: I did a hack in the ixgbe driver to assume there is
> only
> > one mbuf pool. This simplifies a lot the freeing of mbufs in Tx,
> because
> > we don't have to group them in bulks that shares the same pool (see
> > ixgbe_tx_free_bufs()). The impact of this hack is quite good: +~5% on
> a
> > real-life forwarding use case.
> 
> I think we already have such optimization ability within DPDK:
> #define DEV_TX_OFFLOAD_MBUF_FAST_FREE   0x00010000
> /**< Device supports optimization for fast release of mbufs.
>  *   When set application must guarantee that per-queue all mbufs comes
> from
>  *   the same mempool and has refcnt = 1.
>  */
> 
> Seems over-optimistic to me, but many PMDs do support it.

Looking at a few drivers using this flag, Intel drivers use rte_mempool_put(m->pool), and thus still reads the second cache line. Only ThunderX seems to use the optimization benefit and use rte_mempool_put_bulk(q->pool).

I would rather see a generic optimization of free()'ing non-segmented packets in the mbuf library, where free() and free_seg() take advantage of knowing whether they are working on the first segment or not - like the is_header indicator in many of the mbuf check functions - and, when working on the first segment, gate access to n->next by m->nb_segs > 1.

Concept:

static inline void
rte_pktmbuf_free(struct rte_mbuf *m)
{
    struct rte_mbuf *m_next;

    /* NOTE: Sanity check of header has moved to __rte_pktmbuf_prefree_seg(). */

    if (m != NULL) {
        if (m->nb_segs == 1) {
            __rte_pktmbuf_free_seg(m, 1);
        } else {
            m_next = m->next;
            __rte_pktmbuf_free_seg(m, 1);
            m = m_next;
            while (m != NULL) {
                m_next = m->next;
                __rte_pktmbuf_free_seg(m, 0);
                m = m_next;
            }
        }
    }
}

static __rte_always_inline void
__rte_pktmbuf_free_seg(struct rte_mbuf *m, int is_header)
{
    m = __rte_pktmbuf_prefree_seg(m, is_header);
    if (likely(m != NULL))
        rte_mbuf_raw_free(m);
}

static __rte_always_inline struct rte_mbuf *
__rte_pktmbuf_prefree_seg(struct rte_mbuf *m, int is_header)
{
    __rte_mbuf_sanity_check(m, is_header);

    if (likely(rte_mbuf_refcnt_read(m) == 1)) {

        if (!RTE_MBUF_DIRECT(m)) {
            rte_pktmbuf_detach(m);
            if (RTE_MBUF_HAS_EXTBUF(m) &&
                RTE_MBUF_HAS_PINNED_EXTBUF(m) &&
                __rte_pktmbuf_pinned_extbuf_decref(m))
                return NULL;
        }

        if (is_header && m->nb_segs == 1)
            return m; /* NOTE: Avoid touching (writing to) the second cache line. */

        if (m->next != NULL) {
            m->next = NULL;
            m->nb_segs = 1;
        }

        return m;

    } else if (__rte_mbuf_refcnt_update(m, -1) == 0) {

        if (!RTE_MBUF_DIRECT(m)) {
            rte_pktmbuf_detach(m);
            if (RTE_MBUF_HAS_EXTBUF(m) &&
                RTE_MBUF_HAS_PINNED_EXTBUF(m) &&
                __rte_pktmbuf_pinned_extbuf_decref(m))
                return NULL;
        }

        if (is_header && m->nb_segs == 1) {
            /* NOTE: Avoid touching (writing to) the second cache line. */
            rte_mbuf_refcnt_set(m, 1);
            return m;
        }

        if (m->next != NULL) {
            m->next = NULL;
            m->nb_segs = 1;
        }
        rte_mbuf_refcnt_set(m, 1);

        return m;
    }
    return NULL;
}

Furthermore, this concept might provide an additional performance improvement by moving m->pool to the first cache line, so rte_mempool_put() in rte_mbuf_raw_free() wouldn't have to touch the second cache line either.


  reply	other threads:[~2020-11-05  9:04 UTC|newest]

Thread overview: 170+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-29  9:27 [dpdk-dev] [PATCH 00/15] remove mbuf timestamp Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 01/15] eventdev: remove software Rx timestamp Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 02/15] mbuf: add Rx timestamp dynamic flag Thomas Monjalon
2020-10-29  9:58   ` Andrew Rybchenko
2020-10-29 18:19     ` Ajit Khaparde
2020-10-29  9:27 ` [dpdk-dev] [PATCH 03/15] ethdev: register mbuf field and flags for timestamp Thomas Monjalon
2020-10-29 10:08   ` Andrew Rybchenko
2020-10-29 10:12     ` Thomas Monjalon
2020-10-29 10:33       ` Andrew Rybchenko
2020-10-29 10:46         ` Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 04/15] latency: switch timestamp to dynamic mbuf field Thomas Monjalon
2020-10-29 10:13   ` Andrew Rybchenko
2020-10-29 10:40     ` Thomas Monjalon
2020-10-29 14:20   ` Pattan, Reshma
2020-10-29 16:15     ` Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 05/15] net/ark: " Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 06/15] net/dpaa2: " Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 07/15] net/mlx5: fix dynamic mbuf offset lookup check Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 08/15] net/mlx5: switch timestamp to dynamic mbuf field Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 09/15] net/nfb: " Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 10/15] net/octeontx2: " Thomas Monjalon
2020-10-29 11:02   ` Andrew Rybchenko
2020-10-29 11:34     ` Thomas Monjalon
2020-10-29 11:37       ` Andrew Rybchenko
2020-10-29 11:52     ` Slava Ovsiienko
2020-10-30 12:41       ` Jerin Jacob
2020-11-01 16:12         ` Thomas Monjalon
2020-11-01 20:00         ` Andrew Rybchenko
2020-10-29  9:27 ` [dpdk-dev] [PATCH 11/15] net/pcap: " Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 12/15] app/testpmd: " Thomas Monjalon
2020-10-29 10:20   ` Andrew Rybchenko
2020-10-29 10:43     ` Thomas Monjalon
2020-10-29 10:52       ` Andrew Rybchenko
2020-10-29  9:27 ` [dpdk-dev] [PATCH 13/15] examples/rxtx_callbacks: switch timestamp to dynamic field Thomas Monjalon
2020-10-29 10:21   ` Andrew Rybchenko
2020-10-29 10:44     ` Thomas Monjalon
2020-10-29  9:27 ` [dpdk-dev] [PATCH 14/15] mbuf: remove deprecated timestamp field Thomas Monjalon
2020-10-29 10:23   ` Andrew Rybchenko
2020-10-29 18:18     ` Ajit Khaparde
2020-10-29 14:48   ` Kinsella, Ray
2020-10-29  9:27 ` [dpdk-dev] [PATCH 15/15] mbuf: move pool pointer in hotter first half Thomas Monjalon
2020-10-29 10:50   ` Andrew Rybchenko
2020-10-29 10:56     ` Thomas Monjalon
2020-10-29 14:15       ` Ananyev, Konstantin
2020-10-29 18:45         ` Ajit Khaparde
2020-10-31 18:20           ` [dpdk-dev] [PATCH 15/15] mbuf: move pool pointer in hotterfirst half Morten Brørup
2020-10-31 20:40             ` Thomas Monjalon
2020-11-01  9:12               ` Morten Brørup
2020-11-01 16:21                 ` Thomas Monjalon
2020-11-01 16:38                 ` Thomas Monjalon
2020-11-01 20:59                   ` Morten Brørup
2020-11-02 15:58                     ` Thomas Monjalon
2020-11-03 12:10                       ` Morten Brørup
2020-11-03 12:25                         ` Bruce Richardson
2020-11-03 13:46                           ` Morten Brørup
2020-11-03 13:50                             ` Bruce Richardson
2020-11-03 14:03                               ` Morten Brørup
2020-11-03 14:02                         ` Slava Ovsiienko
2020-11-03 15:03                           ` Morten Brørup
2020-11-04 15:00                             ` Olivier Matz
2020-11-05  0:25                               ` Ananyev, Konstantin
2020-11-05  9:04                                 ` Morten Brørup [this message]
2020-11-05  9:35                                 ` Morten Brørup
2020-11-05 10:29                                   ` Bruce Richardson
2020-10-29 14:42   ` [dpdk-dev] [PATCH 15/15] mbuf: move pool pointer in hotter first half Kinsella, Ray
2020-11-01 18:06 ` [dpdk-dev] [PATCH v2 00/14] remove mbuf timestamp Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 01/14] eventdev: remove software Rx timestamp Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 02/14] mbuf: add Rx timestamp dynamic flag Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 03/14] ethdev: register mbuf field and flags for timestamp Thomas Monjalon
2020-11-02 15:39     ` Olivier Matz
2020-11-02 16:52       ` Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 04/14] latency: switch timestamp to dynamic mbuf field Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 05/14] net/ark: " Thomas Monjalon
2020-11-02 15:32     ` Olivier Matz
2020-11-02 16:10       ` Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 06/14] net/dpaa2: " Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 07/14] net/mlx5: fix dynamic mbuf offset lookup check Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 08/14] net/mlx5: switch timestamp to dynamic mbuf field Thomas Monjalon
2020-11-02  5:08     ` Ruifeng Wang
2020-11-02 23:20     ` David Christensen
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 09/14] net/nfb: " Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 10/14] net/octeontx2: " Thomas Monjalon
2020-11-01 18:28     ` Jerin Jacob
2020-11-02  9:38       ` Thomas Monjalon
2020-11-02 11:01         ` Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 11/14] net/pcap: " Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 12/14] app/testpmd: " Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 13/14] examples/rxtx_callbacks: switch timestamp to dynamic field Thomas Monjalon
2020-11-01 18:06   ` [dpdk-dev] [PATCH v2 14/14] mbuf: remove deprecated timestamp field Thomas Monjalon
2020-11-02 15:41     ` Olivier Matz
2020-11-02 15:47       ` David Marchand
2020-11-02 15:49         ` Thomas Monjalon
2020-11-01 18:08   ` [dpdk-dev] [PATCH v2 00/14] remove mbuf timestamp Thomas Monjalon
2020-11-03  0:13 ` [dpdk-dev] [PATCH v3 00/16] " Thomas Monjalon
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 01/16] eventdev: remove software Rx timestamp Thomas Monjalon
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 02/16] mbuf: add Rx timestamp flag and helpers Thomas Monjalon
2020-11-03  9:33     ` Olivier Matz
2020-11-03  9:59       ` Thomas Monjalon
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 03/16] latency: switch Rx timestamp to dynamic mbuf field Thomas Monjalon
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 04/16] net/ark: " Thomas Monjalon
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 05/16] net/dpaa2: " Thomas Monjalon
2020-11-03  9:18     ` Hemant Agrawal
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 06/16] net/mlx5: fix dynamic mbuf offset lookup check Thomas Monjalon
2020-11-03  8:12     ` Slava Ovsiienko
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 07/16] net/mlx5: switch Rx timestamp to dynamic mbuf field Thomas Monjalon
2020-11-03  8:12     ` Slava Ovsiienko
2020-11-03  0:13   ` [dpdk-dev] [PATCH v3 08/16] net/nfb: " Thomas Monjalon
2020-11-03 10:20     ` Olivier Matz
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 09/16] net/octeontx2: " Thomas Monjalon
2020-11-03 10:52     ` Harman Kalra
2020-11-03 11:22       ` Thomas Monjalon
2020-11-03 12:21         ` Thomas Monjalon
2020-11-03 14:23           ` [dpdk-dev] [EXT] " Harman Kalra
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 10/16] net/pcap: " Thomas Monjalon
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 11/16] app/testpmd: " Thomas Monjalon
2020-11-03 10:23     ` Olivier Matz
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 12/16] examples/rxtx_callbacks: switch timestamp to dynamic field Thomas Monjalon
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 13/16] ethdev: add doxygen comment for Rx timestamp API Thomas Monjalon
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 14/16] mbuf: remove deprecated timestamp field Thomas Monjalon
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 15/16] mbuf: add Tx timestamp registration helper Thomas Monjalon
2020-11-03  0:14   ` [dpdk-dev] [PATCH v3 16/16] ethdev: include mbuf registration in Tx timestamp API Thomas Monjalon
2020-11-03  7:54     ` Slava Ovsiienko
2020-11-03  9:00   ` [dpdk-dev] [PATCH v3 00/16] remove mbuf timestamp David Marchand
2020-11-03 12:21 ` [dpdk-dev] [PATCH v4 " Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 01/16] eventdev: remove software Rx timestamp Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 02/16] mbuf: add Rx timestamp flag and helpers Thomas Monjalon
2020-11-03 12:34     ` Andrew Rybchenko
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 03/16] latency: switch Rx timestamp to dynamic mbuf field Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 04/16] net/ark: " Thomas Monjalon
2020-11-03 12:37     ` Andrew Rybchenko
2020-11-03 13:08       ` Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 05/16] net/dpaa2: " Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 06/16] net/mlx5: fix dynamic mbuf offset lookup check Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 07/16] net/mlx5: switch Rx timestamp to dynamic mbuf field Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 08/16] net/nfb: " Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 09/16] net/octeontx2: " Thomas Monjalon
2020-11-03 12:21   ` [dpdk-dev] [PATCH v4 10/16] net/pcap: " Thomas Monjalon
2020-11-03 12:22   ` [dpdk-dev] [PATCH v4 11/16] app/testpmd: " Thomas Monjalon
2020-11-03 12:22   ` [dpdk-dev] [PATCH v4 12/16] examples/rxtx_callbacks: switch timestamp to dynamic field Thomas Monjalon
2020-11-03 12:22   ` [dpdk-dev] [PATCH v4 13/16] ethdev: add doxygen comment for Rx timestamp API Thomas Monjalon
2020-11-03 12:40     ` Andrew Rybchenko
2020-11-03 12:22   ` [dpdk-dev] [PATCH v4 14/16] mbuf: remove deprecated timestamp field Thomas Monjalon
2020-11-03 12:22   ` [dpdk-dev] [PATCH v4 15/16] mbuf: add Tx timestamp registration helper Thomas Monjalon
2020-11-03 12:42     ` Andrew Rybchenko
2020-11-03 12:22   ` [dpdk-dev] [PATCH v4 16/16] ethdev: include mbuf registration in Tx timestamp API Thomas Monjalon
2020-11-03 12:45     ` Andrew Rybchenko
2020-11-03 14:09 ` [dpdk-dev] [PATCH v5 00/16] remove mbuf timestamp Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 01/16] eventdev: remove software Rx timestamp Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 02/16] mbuf: add Rx timestamp flag and helpers Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 03/16] latency: switch Rx timestamp to dynamic mbuf field Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 04/16] net/ark: " Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 05/16] net/dpaa2: " Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 06/16] net/mlx5: fix dynamic mbuf offset lookup check Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 07/16] net/mlx5: switch Rx timestamp to dynamic mbuf field Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 08/16] net/nfb: " Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 09/16] net/octeontx2: " Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 10/16] net/pcap: " Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 11/16] app/testpmd: " Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 12/16] examples/rxtx_callbacks: switch timestamp to dynamic field Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 13/16] ethdev: add doxygen comment for Rx timestamp API Thomas Monjalon
2020-11-03 19:07     ` Ajit Khaparde
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 14/16] mbuf: remove deprecated timestamp field Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 15/16] mbuf: add Tx timestamp registration helper Thomas Monjalon
2020-11-03 14:09   ` [dpdk-dev] [PATCH v5 16/16] ethdev: include mbuf registration in Tx timestamp API Thomas Monjalon
2020-11-03 14:17   ` [dpdk-dev] [PATCH v5 00/16] remove mbuf timestamp Olivier Matz
2020-11-03 14:44     ` Thomas Monjalon
2020-11-03 16:08   ` Stephen Hemminger
2020-11-03 16:20     ` Thomas Monjalon
2020-11-03 17:42       ` Stephen Hemminger
2020-11-03 17:55         ` Thomas Monjalon

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