linux-kernel - Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance regression on Xen

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Message-ID: <20150602095237.GL19403@zion.uk.xensource.com>
Date:	Tue, 2 Jun 2015 10:52:37 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	George Dunlap <george.dunlap@...citrix.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jonathan Davies <Jonathan.Davies@...rix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"Stefano Stabellini" <stefano.stabellini@...citrix.com>,
	netdev <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"Paul Durrant" <paul.durrant@...rix.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Felipe Franciosi <felipe.franciosi@...rix.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	"David Vrabel" <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance
 regression on Xen

Hi Eric

Sorry for coming late to the discussion.

On Thu, Apr 16, 2015 at 05:42:16AM -0700, Eric Dumazet wrote:
> On Thu, 2015-04-16 at 11:01 +0100, George Dunlap wrote:
> 
> > He suggested that after he'd been prodded by 4 more e-mails in which two
> > of us guessed what he was trying to get at.  That's what I was
> > complaining about.
> 
> My big complain is that I suggested to test to double the sysctl, which
> gave good results.
> 

Do I understand correctly that it's acceptable to you to double the size
of the buffer? If so I will send a patch to do that.

Wei.

> Then you provided a patch using a 8x factor. How does that sound ?
> 
> Next time I ask a raise, I should try a 8x factor as well, who knows,
> it might be accepted.
> 
> 
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