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Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance regression on Xen
- To: Eric Dumazet <eric.dumazet@xxxxxxxxx>
- From: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
- Date: Mon, 20 Apr 2015 12:03:02 +0100
- Cc: Jonathan Davies <Jonathan.Davies@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, netdev <netdev@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, Christoffer Dall <christoffer.dall@xxxxxxxxxx>, Felipe Franciosi <felipe.franciosi@xxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, David Vrabel <david.vrabel@xxxxxxxxxx>
- Delivery-date: Mon, 20 Apr 2015 11:03:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Thu, Apr 16, 2015 at 1:42 PM, Eric Dumazet <eric.dumazet@xxxxxxxxx> 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.
>
> 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.
I see. I chose the value that Stefano had determined had completely
eliminated the overhead. Doubling the value reduces the overhead to
8%, which should be fine for a short-term fix while we git a proper
mid/long-term fix.
-George
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