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

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Date:	Thu, 10 May 2007 11:20:36 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Vlad Yasevich <vladislav.yasevich@...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

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?

rick jones
-
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