From: Rick Jones <rick.jones2@hp•com>
To: James Yonan <james@openvpn•net>
Cc: Eric Dumazet <eric.dumazet@gmail•com>, netdev <netdev@vger•kernel.org>
Subject: Re: GSO/GRO and UDP performance
Date: Fri, 06 Sep 2013 09:42:17 -0700 [thread overview]
Message-ID: <522A05E9.3090206@hp.com> (raw)
In-Reply-To: <1378472829.31445.21.camel@edumazet-glaptop>
On 09/06/2013 06:07 AM, Eric Dumazet wrote:
> On Fri, 2013-09-06 at 03:22 -0600, James Yonan wrote:
>
>> So I think that playing well with GSO/GRO is essential to get speedup in
>> UDP apps because of this 43x multiplier.
>>
>
> Thats not true. GRO cannot aggregate more than 16+1 packets.
>
> I think we cannot aggregate UDP packets, because UDP lacks sequence
> numbers, so reorders would be a problem.
>
> You really need something that is not UDP generic.
It may not be as sexy, and it cannot get the 43x multiplier (just what
*is* the service demand change on a netperf TCP_STREAM test these days
between GSO/GRO on and off anyway?), but looking for basic path-length
reductions would be goodness.
rick jones
next prev parent reply other threads:[~2013-09-06 16:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-04 10:07 GSO/GRO and UDP performance James Yonan
2013-09-04 11:53 ` Eric Dumazet
2013-09-06 9:22 ` James Yonan
2013-09-06 13:07 ` Eric Dumazet
2013-09-06 16:42 ` Rick Jones [this message]
2013-09-06 19:26 ` James Yonan
2013-09-06 19:32 ` Eric Dumazet
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