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Re: [Xen-devel] "tcp: refine TSO autosizing" causes performance regression on Xen
- To: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
- From: Tim Deegan <tim@xxxxxxx>
- Date: Thu, 16 Apr 2015 14:00:43 +0100
- Cc: Jonathan Davies <Jonathan.Davies@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Eric Dumazet <eric.dumazet@xxxxxxxxx>, 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: Thu, 16 Apr 2015 13:01:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
At 12:39 +0100 on 16 Apr (1429187952), George Dunlap wrote:
> Your comment lists three benefits:
> 1. better RTT estimation
> 2. faster recovery
> 3. high rates
>
> #3 is just marketing fluff; it's also contradicted by the statement that
> immediately follows it -- i.e., there are drivers for which the
> limitation does *not* give high rates.
AFAICT #3 is talking about throughput _under TCP_, where inflating the
RTT will absolutely cause problems.
Tim.
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