netdev - Re: Poorer networking performance in later kernels?

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Message-ID: <1461002705.10638.121.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Mon, 18 Apr 2016 11:05:05 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Butler, Peter" <pbutler@...usnet.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Poorer networking performance in later kernels?

On Mon, 2016-04-18 at 16:27 +0000, Butler, Peter wrote:
> Hi Eric
> 
> Thanks for your response.  My apologies for being late in getting back
> to you - I wasn't able to have access to the lab hardware on the
> weekend.
> 
> I performed your test as suggested - I've provided a side-by-side diff
> of the nstat output below for the SCTP test only (not the TCP test).
> Note that the fields that are output are somewhat different for the
> two kernels - i.e. some fields exist in one but not the other
> (presumably this comes from the kernel internals?).
> 
> Other than seeing 'larger' throughput numbers in this output I'm not
> sure what to take from it - I'm certainly not a networking
> expert :-(   Let me know if there's anything that speaks to you.
> 
> Note that this test was again done on a clean, freshly rebooted and
> idle system.  Let me know if there's any issues with the output format
> of this data in the email.
> 
> Thanks,
> 
> Peter

OK, please do not top-post on netdev.

I can not really comment on SCTP, could you please post numbers with
TCP ?

Thanks !