netdev - Re: Patch for tbench regression.

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Date:	Mon, 29 Sep 2008 11:12:44 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...vell.com>
Subject: Re: Patch for tbench regression.

On Mon, Sep 29, 2008 at 01:15:30AM +0400, Evgeniy Polyakov wrote:
>
> Idea is rather trivial: disable TSO and GSO on loopback. The latter was

Weird.  That's the very first thing I tried but for me it goes
the other way.

With TSO/GSO:

Throughput 169.19 MB/sec 1 procs

Without:

Throughput 24.0079 MB/sec 1 procs

Note that I only disabled TSO/GSO using ethtool:

etch1:~# ethtool -k lo
Offload parameters for lo:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off
etch1:~# 

Can you see if reverting the patch but using ethtool gives you the
same results?

PS I'm using FV Xen.

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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