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

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Message-ID: <1433261772.1895.20.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 02 Jun 2015 09:16:12 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wei Liu <wei.liu2@...rix.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>,
	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

On Tue, 2015-06-02 at 10:52 +0100, Wei Liu wrote:
> 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.

Absolutely.


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