Message-ID: <1429188136.7346.198.camel@edumazet-glaptop2.roam.corp.google.com>
Subject: Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance
 regression on Xen
From: Eric Dumazet <eric.dumazet@gmail.com>
To: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
        Jonathan Davies <Jonathan.Davies@citrix.com>,
        "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
        Wei Liu <wei.liu2@citrix.com>, Ian Campbell <Ian.Campbell@citrix.com>,
        Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
        netdev <netdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Paul Durrant <paul.durrant@citrix.com>,
        Christoffer Dall <christoffer.dall@linaro.org>,
        Felipe Franciosi <felipe.franciosi@citrix.com>,
        linux-arm-kernel@lists.infradead.org,
        David Vrabel <david.vrabel@citrix.com>
Date: Thu, 16 Apr 2015 05:42:16 -0700
In-Reply-To: <552F887A.4060708@eu.citrix.com>
References: <alpine.DEB.2.02.1504091344260.7690@kaball.uk.xensource.com>
	 <1428596218.25985.263.camel@edumazet-glaptop2.roam.corp.google.com>
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	 <1428932970.3834.4.camel@edumazet-glaptop2.roam.corp.google.com>
	 <CAFLBxZYt7-v29ysm=f+5QMOw64_QhESjzj98udba+1cS-PfObA@mail.gmail.com>
	 <1429115934.7346.107.camel@edumazet-glaptop2.roam.corp.google.com>
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	 <1429118948.7346.114.camel@edumazet-glaptop2.roam.corp.google.com>
	 <552EA2BC.5000707@eu.citrix.com>
	 <1429120373.7346.125.camel@edumazet-glaptop2.roam.corp.google.com>
	 <552EA844.5010308@eu.citrix.com>
	 <1429121979.7346.138.camel@edumazet-glaptop2.roam.corp.google.com>
	 <552F7936.9070205@eu.citrix.com> <552F7EF4.9030107@iogearbox.net>
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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.

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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