netdev - Re: TCP transmit performance regression

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Message-ID: <CACVXFVP6DAfrRsYT_=uTi4C35SQAic9=KTyetAz-cnZO+es35w@mail.gmail.com>
Date:	Mon, 9 Jul 2012 13:13:26 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Network Development <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: TCP transmit performance regression

On Fri, Jul 6, 2012 at 1:16 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2012-07-06 at 06:58 +0200, Eric Dumazet wrote:
>> On Fri, 2012-07-06 at 08:45 +0800, Ming Lei wrote:
>>
>> > Unfortunately, the patch still hasn't any improvement on the transmit
>> > performance of beagle-xm.
>>
>> Ah yes, I need to change usbnet as well to be able to fully recycle the
>> big skbs allocated in turbo mode.
>>
>> Right now they are constantly allocated/freed and this sucks if SLAB
>> wants to check poison bytes in debug mode.
>
> In the mean time, you also can use the following patch I have to polish,
> but this should give you a nice boost, since the big skb skb->head wont
> be checked by SLAB debug :

Unfortunately, the patch makes the result of the same test  worsen than
without the patch, :-(


Thanks,
-- 
Ming Lei
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