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Re: [Xen-users] Bad TCP accept performance

  • To: Pasi Kärkkäinen <pasik@xxxxxx>
  • From: Carl Byström <cgbystrom@xxxxxxxxx>
  • Date: Wed, 25 May 2011 09:51:39 +0200
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 25 May 2011 00:53:23 -0700
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On Wed, May 25, 2011 at 7:54 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
Btw did you use 64bit or 32bit VMs? I'd suggest to try 32bit aswell if you didn't.

I've tried it on EC2, but not on our private servers yet. Made no difference there.

Someone has also suggested that increasing the backlog (well beyond 128) could help improve things.
tcp_syncookies was another suggestion. I have no idea what they will do, haven't tried them yet.

Also got a report (see the previous link posted) from someone on KVM with a lot better performance.
Whether those were correctly performed, I cannot tell but at least interesting if that's the case.

Carl Byström

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