netdev - Re: [RFC] New driver API to speed up small packets xmits

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Message-ID: <4643654F.5060207@hp.com>
Date:	Thu, 10 May 2007 14:32:47 -0400
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Krishna Kumar2 <krkumar2@...ibm.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org
Subject: Re: [RFC] New driver API to speed up small packets xmits

Rick Jones wrote:
> Vlad Yasevich wrote:
>> Rick Jones wrote:
>>
>>>> It is the reverse - GSO will segment one super-packet just before
>>>> calling
>>>> the driver so that the stack is traversed only once. In my case, I am
>>>> trying to send out multiple skbs, possibly small packets, in one shot.
>>>> GSO will not help for small packets.
>>>
>>> If there are small packets that implies small sends, which suggests that
>>> they would be coalesced either implicitly by the Nagle algorithm or
>>> explicitly with TCP_CORK no?
>>>
>>> rick jones
>>> -
>>
>>
>> May be for TCP?  What about other protocols?
> 
> There are other protocols?-)  True, UDP, and I suppose certain modes of
> SCTP might be sending streams of small packets, as might TCP with
> TCP_NODELAY set.
> 
> Do they often queue-up outside the driver?

Not sure if DCCP might fall into this category as well...

I think the idea of this patch is gather some number of these small packets and
shove them at the driver in one go instead of each small packet at a time.

I might be helpful, but reserve judgment till I see more numbers.

-vlad
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