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From: Thomas Monjalon <thomas@monjalon.net>
To: Rakesh Kudurumalla <rkudurumalla@marvell.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Cc: "stable@dpdk.org" <stable@dpdk.org>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"david.marchand@redhat.com" <david.marchand@redhat.com>,
	"ferruh.yigit@intel.com" <ferruh.yigit@intel.com>,
	"andrew.rybchenko@oktetlabs.ru" <andrew.rybchenko@oktetlabs.ru>,
	"ajit.khaparde@broadcom.com" <ajit.khaparde@broadcom.com>
Subject: Re: [EXT] Re: [dpdk-stable] [PATCH v2] test: avoid hang if queues are full and Tx fails
Date: Mon, 29 Nov 2021 10:13:58 +0100	[thread overview]
Message-ID: <4821372.GXAFRqVoOG@thomas> (raw)
In-Reply-To: <BN8PR18MB2482B2E239B0CB7215B2D84ACF669@BN8PR18MB2482.namprd18.prod.outlook.com>

29/11/2021 09:52, Rakesh Kudurumalla:
> From: Thomas Monjalon <thomas@monjalon.net>
> > 22/11/2021 08:59, Rakesh Kudurumalla:
> > > From: Thomas Monjalon <thomas@monjalon.net>
> > > > 20/07/2021 18:50, Rakesh Kudurumalla:
> > > > > Current pmd_perf_autotest() in continuous mode tries to enqueue
> > > > > MAX_TRAFFIC_BURST completely before starting the test. Some
> > > > > drivers cannot accept complete MAX_TRAFFIC_BURST even though
> > rx+tx
> > > > > desc
> > > > count
> > > > > can fit it.
> > > >
> > > > Which driver is failing to do so?
> > > > Why it cannot enqueue 32 packets?
> > >
> > > Octeontx2 driver is failing to enqueue because hardware buffers are full
> > before test.

Aren't you stopping the support of octeontx2?
Why do you care now?

> > 
> > Why hardware buffers are full?
> Hardware buffers are full because number of number of descriptors in continuous mode 
> Is less than MAX_TRAFFIC_BURST, so if enque fails , there is no way hardware can drop the
> Packets . pmd_per_autotest application evaluates performance after enqueueing packets
> Initially.
> > 
> > > pmd_perf_autotest() in continuous mode tries to enqueue
> > > MAX_TRAFFIC_BURST (2048) before starting the test.
> > >
> > > > > This patch changes behaviour to stop enqueuing after few retries.
> > > >
> > > > If there is a real limitation, there will be issues in more places
> > > > than this test program.
> > > > I feel it should be addressed either in the driver or at ethdev level.
> > > >
> > > > [...]
> > > > > @@ -480,10 +483,19 @@ main_loop(__rte_unused void *args)
> > > > >  			nb_tx = RTE_MIN(MAX_PKT_BURST, num);
> > > > >  			nb_tx = rte_eth_tx_burst(portid, 0,
> > > > >  						&tx_burst[idx], nb_tx);
> > > > > +			if (nb_tx == 0)
> > > > > +				retry_cnt++;
> > > > >  			num -= nb_tx;
> > > > >  			idx += nb_tx;
> > > > > +			if (retry_cnt == MAX_RETRY_COUNT) {
> > > > > +				retry_cnt = 0;
> > > > > +				break;
> > > > > +			}




  reply	other threads:[~2021-11-29  9:14 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210720124713.603674-1-rkudurumalla@marvell.com>
2021-07-20 16:50 ` [dpdk-dev] " Rakesh Kudurumalla
2021-10-19 10:19   ` Rakesh Kudurumalla
2021-10-29  7:18     ` Rakesh Kudurumalla
2021-11-12 11:32   ` [dpdk-stable] " Thomas Monjalon
2021-11-22  7:59     ` [EXT] " Rakesh Kudurumalla
2021-11-22  8:58       ` Thomas Monjalon
2021-11-29  8:52         ` Rakesh Kudurumalla
2021-11-29  9:13           ` Thomas Monjalon [this message]
2021-12-13  6:40             ` Rakesh Kudurumalla
2022-01-10  9:04               ` Rakesh Kudurumalla
2022-02-01  6:30                 ` Rakesh Kudurumalla
2022-02-01  7:44                   ` Thomas Monjalon
2022-02-14  4:56                     ` Rakesh Kudurumalla
2022-05-09 10:01                       ` Rakesh Kudurumalla
2022-05-24  5:39                         ` Rakesh Kudurumalla
2022-05-25  8:02                           ` Thomas Monjalon

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