Re: TCP transmit performance regression

Ming Lei
2012-07-09T05:13:27Z

On Fri, Jul 6, 2012 at 1:16 PM, Eric Dumazet <eric.dumazet@gmail.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