From: Stephen Hemminger <stephen@networkplumber.org>
To: Saber Rezvani <irsaber@zoho.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] IXGBE throughput loss with 4+ cores
Date: Tue, 28 Aug 2018 09:01:42 -0700 [thread overview]
Message-ID: <20180828090142.1262c5ea@shemminger-XPS-13-9360> (raw)
In-Reply-To: <74400e6a-91ba-3648-0980-47ceae1089a7@zoho.com>
On Tue, 28 Aug 2018 17:34:27 +0430
Saber Rezvani <irsaber@zoho.com> wrote:
> Hi,
>
>
> I have run multi_process/symmetric_mp example in DPDK example directory.
> For a one process its throughput is line rate but as I increase the
> number of cores I see decrease in throughput. For example, If the number
> of queues set to 4 and each queue assigns to a single core, then the
> throughput will be something about 9.4. if 8 queues, then throughput
> will be 8.5.
>
> I have read the following, but it was not convincing.
>
> http://mails.dpdk.org/archives/dev/2015-October/024960.html
>
>
> I am eagerly looking forward to hearing from you, all.
>
>
> Best wishes,
>
> Saber
>
>
Not completely surprising. If you have more cores than packet line rate
then the number of packets returned for each call to rx_burst will be less.
With large number of cores, most of the time will be spent doing reads of
PCI registers for no packets!
next prev parent reply other threads:[~2018-08-28 16:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-28 13:04 Saber Rezvani
2018-08-28 16:01 ` Stephen Hemminger [this message]
2018-08-28 17:05 ` Saber Rezvani
2018-08-28 19:09 ` Wiles, Keith
2018-08-28 19:16 ` Saber Rezvani
2018-08-28 21:09 ` Wiles, Keith
2018-08-29 17:19 ` Saber Rezvani
2018-08-29 18:52 ` Wiles, Keith
2018-08-30 4:08 ` Saber Rezvani
2018-09-06 6:10 Saber Rezvani
2018-09-06 17:48 ` Wiles, Keith
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