From: Stephen Hemminger <stephen@networkplumber.org>
To: shengxiao qian <tedsxqian@gmail.com>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] wrong core receive the package
Date: Wed, 21 Mar 2018 07:48:33 -0700 [thread overview]
Message-ID: <20180321074833.6a3d2656@xeon-e3> (raw)
In-Reply-To: <CAPd3biDbxRohHLENKijwSthiEWCspFoGRV8ypLHkmSyPR+ABaw@mail.gmail.com>
On Wed, 21 Mar 2018 11:13:19 +0800
shengxiao qian <tedsxqian@gmail.com> wrote:
> Hi there;
> Our machine has 2 cpus（Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz）with
> 40 cores.
> If the core num is less than or equal to 16. the application with dpdk
> works fine.But if the core num more than 16.there is something wrong with
> it.
> In our test scenario(more then 16 cores), server a is a tcp client and
> server b is a tcp server. Server a sends a syn packet to server B with
> core1, and server B returns a syn ack message to server a.Although the hash
> value of these two packets is the same, syn ack packets are distributed to
> server a other core(not the send core),Can anyone give some help?
>
RSS hash is not symmetrical. The SYN and SYN-ACK packets have swapped
address and port (src/dest); therefore the hash will be different.
There are some weaker RSS hash keys that are symmetrical.
next prev parent reply other threads:[~2018-03-21 14:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-21 3:13 shengxiao qian
2018-03-21 14:48 ` Stephen Hemminger [this message]
2018-03-22 6:40 ` shengxiao qian
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