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

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Message-ID: <OF3528B24A.B797EFB6-ON652572D8.001F4AB0-652572D8.001F6B22@in.ibm.com>
Date:	Fri, 11 May 2007 11:13:10 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	Gagan Arneja <gaagaan@...il.com>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org,
	Rick Jones <rick.jones2@...com>,
	Sridhar Samudrala <sri@...ibm.com>
Subject: Re: [RFC] New driver API to speed up small packets xmits

Gagan Arneja <gaagaan@...il.com> wrote on 05/11/2007 11:05:47 AM:

> Krishna Kumar2 wrote:
> > I haven't seen reordering packets (I did once when I was having a bug
in
> > the requeue code, some TCP messages on receiver indicating packets out
of
> > order). When a send fails, the packet are requeued in reverse (go to
end of
> > the failed skb and traverse back to the failed skb and requeue each
skb).
> > Since new inserts go to the end, the queue is guaranteed to be in
order.
>
> queue_lock is dropped when you're in xmit. There's no guarantee packets
> won't be queued up while you're trying a transmit.

Right, but I am the sole dequeue'r, and on failure, I requeue those packets
to
the beginning of the queue (just as it would happen in the regular case of
one
packet xmit/failure/requeue).

- KK

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