From: Cliff Burdick <shaklee3@gmail.com>
To: "Lombardo, Ed" <Ed.Lombardo@netscout.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
"users@dpdk.org" <users@dpdk.org>
Subject: Re: How to increase mbuf size in dpdk version 17.11
Date: Tue, 1 Mar 2022 19:56:39 -0800 [thread overview]
Message-ID: <CA+Gp1nZueA3uM5xVFU8+mazSHSOhB8ZbKo04xZgP_s-2O9nB+A@mail.gmail.com> (raw)
In-Reply-To: <SJ0PR01MB6399BFC8E118356D1FF30E578F039@SJ0PR01MB6399.prod.exchangelabs.com>
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That's showing you have 0 hugepages free. Maybe they weren't passed through
to the VM properly?
On Tue, Mar 1, 2022 at 7:50 PM Lombardo, Ed <Ed.Lombardo@netscout.com>
wrote:
> [root@vSTREAM_632 ~]# cat /proc/meminfo
>
> MemTotal: 32778372 kB
>
> MemFree: 15724124 kB
>
> MemAvailable: 15897392 kB
>
> Buffers: 18384 kB
>
> Cached: 526768 kB
>
> SwapCached: 0 kB
>
> Active: 355140 kB
>
> Inactive: 173360 kB
>
> Active(anon): 62472 kB
>
> Inactive(anon): 12484 kB
>
> Active(file): 292668 kB
>
> Inactive(file): 160876 kB
>
> Unevictable: 13998696 kB
>
> Mlocked: 13998696 kB
>
> SwapTotal: 3906556 kB
>
> SwapFree: 3906556 kB
>
> Dirty: 76 kB
>
> Writeback: 0 kB
>
> AnonPages: 13986156 kB
>
> Mapped: 95500 kB
>
> Shmem: 16864 kB
>
> Slab: 121952 kB
>
> SReclaimable: 71128 kB
>
> SUnreclaim: 50824 kB
>
> KernelStack: 4608 kB
>
> PageTables: 31524 kB
>
> NFS_Unstable: 0 kB
>
> Bounce: 0 kB
>
> WritebackTmp: 0 kB
>
> CommitLimit: 19247164 kB
>
> Committed_AS: 14170424 kB
>
> VmallocTotal: 34359738367 kB
>
> VmallocUsed: 212012 kB
>
> VmallocChunk: 34342301692 kB
>
> Percpu: 2816 kB
>
> HardwareCorrupted: 0 kB
>
> AnonHugePages: 13228032 kB
>
> CmaTotal: 0 kB
>
> CmaFree: 0 kB
>
> HugePages_Total: 1024
>
> HugePages_Free: 0
>
> HugePages_Rsvd: 0
>
> HugePages_Surp: 0
>
> Hugepagesize: 2048 kB
>
> DirectMap4k: 104320 kB
>
> DirectMap2M: 33449984 kB
>
>
>
> *From:* Cliff Burdick <shaklee3@gmail.com>
> *Sent:* Tuesday, March 1, 2022 10:45 PM
> *To:* Lombardo, Ed <Ed.Lombardo@netscout.com>
> *Cc:* Stephen Hemminger <stephen@networkplumber.org>; users@dpdk.org
> *Subject:* Re: How to increase mbuf size in dpdk version 17.11
>
>
>
> *External Email:* This message originated outside of NETSCOUT. Do not
> click links or open attachments unless you recognize the sender and know
> the content is safe.
>
> Can you paste the output of "cat /proc/meminfo"?
>
>
>
> On Tue, Mar 1, 2022 at 5:37 PM Lombardo, Ed <Ed.Lombardo@netscout.com>
> wrote:
>
> Here is the output from rte_mempool_dump() after creating the mbuf "
> mbuf_pool_create (mbuf_seg_size=16512, nb_mbuf=32768, socket_id=0)":
> nb_mbuf_per_pool = 32768
> mb_size = 16640
> 16512 * 32768 = 541,065,216
>
> mempool <mbuf_pool_socket_0>@0x17f811400
> flags=10
> pool=0x17f791180
> iova=0x80fe11400
> nb_mem_chunks=1
> size=32768
> populated_size=32768
> header_size=64
> elt_size=16640
> trailer_size=0
> total_obj_size=16704
> private_data_size=64
> avg bytes/object=16704.000000
> internal cache infos:
> cache_size=250
> cache_count[0]=0
> ...
> cache_count[126]=0
> cache_count[127]=0
> total_cache_count=0
> common_pool_count=32768
> no statistics available
>
> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Tuesday, March 1, 2022 5:46 PM
> To: Cliff Burdick <shaklee3@gmail.com>
> Cc: Lombardo, Ed <Ed.Lombardo@netscout.com>; users@dpdk.org
> Subject: Re: How to increase mbuf size in dpdk version 17.11
>
> External Email: This message originated outside of NETSCOUT. Do not click
> links or open attachments unless you recognize the sender and know the
> content is safe.
>
> On Tue, 1 Mar 2022 13:37:07 -0800
> Cliff Burdick <shaklee3@gmail.com> wrote:
>
> > Can you verify how many buffers you're allocating? I don't see how
> > many you're allocating in this thread.
> >
> > On Tue, Mar 1, 2022 at 1:30 PM Lombardo, Ed <Ed.Lombardo@netscout.com>
> > wrote:
> >
> > > Hi Stephen,
> > > The VM is configured to have 32 GB of memory.
> > > Will dpdk consume the 2GB of hugepage memory for the mbufs?
> > > I don't mind having less mbufs with mbuf size of 16K vs original
> > > mbuf size of 2K.
> > >
> > > Thanks,
> > > Ed
> > >
> > > -----Original Message-----
> > > From: Stephen Hemminger <stephen@networkplumber.org>
> > > Sent: Tuesday, March 1, 2022 2:57 PM
> > > To: Lombardo, Ed <Ed.Lombardo@netscout.com>
> > > Cc: users@dpdk.org
> > > Subject: Re: How to increase mbuf size in dpdk version 17.11
> > >
> > > External Email: This message originated outside of NETSCOUT. Do not
> > > click links or open attachments unless you recognize the sender and
> > > know the content is safe.
> > >
> > > On Tue, 1 Mar 2022 18:34:22 +0000
> > > "Lombardo, Ed" <Ed.Lombardo@netscout.com> wrote:
> > >
> > > > Hi,
> > > > I have an application built with dpdk 17.11.
> > > > During initialization I want to change the mbuf size from 2K to 16K.
> > > > I want to receive packet sizes of 8K or more in one mbuf.
> > > >
> > > > The VM running the application is configured to have 2G hugepages.
> > > >
> > > > I tried many things and I get an error when a packet arrives.
> > > >
> > > > I read online that there is #define DEFAULT_MBUF_DATA_SIZE that I
> > > changed from 2176 to ((2048*8)+128), where 128 is for headroom.
> > > > The call to rte_pktmbuf_pool_create() returns success with my
> changes.
> > > > From the rte_mempool_dump() - "rx_nombuf" - Total number of Rx
> > > > mbuf
> > > allocation failures. This value increments each time a packet
> arrives.
> > > >
> > > > Is there any reference document explaining what causes this error?
> > > > Is there a user guide I should follow to make the mbuf size
> > > > change,
> > > starting with the hugepage value?
> > > >
> > > > Thanks,
> > > > Ed
> > >
> > > Did you check that you have enough memory in the system for the
> > > larger footprint?
> > > Using 16K per mbuf is going to cause lots of memory to be consumed.
>
> A little maths you can fill in your own values.
>
> Assuming you want 16K of data.
>
> You need at a minimum [1]
> num_rxq := total number of receive queues
> num_rxd := number of receive descriptors per receive queue
> num_txq := total number of transmit queues (assume all can be full)
> num_txd := number of transmit descriptors
> num_mbufs = num_rxq * num_rxd + num_txq * num_txd + num_cores *
> burst_size
>
> Assuming you are using code copy/pasted from some example like l3fwd.
> With 4 Rxq
>
> num_mbufs = 4 * 1024 + 4 * 1024 + 4 * 32 = 8320
>
> Each mbuf element requires [2]
> elt_size = sizeof(struct rte_mbuf) + HEADROOM + mbuf_size
> = 128 + 128 + 16K = 16640
>
> obj_size = rte_mempool_calc_obj_size(elt_size, 0, NULL)
> = 16832
>
> So total pool is
> num_mbufs * obj_size = 8320 * 16832 = 140,042,240 ~ 139M
>
>
> [1] Some devices line bnxt need multiple buffers per packet.
> [2] Often applications want additional space per mbuf for meta-data.
>
>
>
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next prev parent reply other threads:[~2022-03-02 3:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-01 18:34 Lombardo, Ed
2022-03-01 19:56 ` Stephen Hemminger
2022-03-01 21:30 ` Lombardo, Ed
2022-03-01 21:37 ` Cliff Burdick
2022-03-01 22:46 ` Stephen Hemminger
2022-03-02 1:37 ` Lombardo, Ed
2022-03-02 3:45 ` Cliff Burdick
2022-03-02 3:50 ` Lombardo, Ed
2022-03-02 3:56 ` Cliff Burdick [this message]
2022-03-02 4:40 ` Stephen Hemminger
2022-03-02 5:48 ` Lombardo, Ed
2022-03-02 14:47 ` Cliff Burdick
2022-03-02 14:20 ` Lombardo, Ed
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