From mboxrd@z Thu Jan  1 00:00:00 1970
From: Niraj Tolia <ntolia@gmail.com>
Subject: Re: Fwd: Dom0 OOPS - causes restart
Date: Mon, 12 Jul 2004 17:23:25 +0100
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To: Ian Pratt <ian.pratt@cl.cam.ac.uk>
Cc: Keir Fraser <keir.fraser@cl.cam.ac.uk>, xen-devel@lists.sourceforge.net
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On Mon, 12 Jul 2004 17:06:33 +0100, Ian Pratt <ian.pratt@cl.cam.ac.uk> wrote:
> > Sorry if this email is a duplicate but that patch seems to work. Three
> > runs of Postmark completed without problems. I will let you know in
> > case anything else turns up though.
> 
> While debugging this we spotted what looks like a network
> performance issue: We were only receiving 500Mb/s of TCP
> throughput into domain 1 from the LAN rather than the usual
> 895Mb/s (which is what you get for transmit; 128KB socket buffer
> size).
> 
> Are you seeing any odd performance numbers?
> 

Still not at the stage yet when I can start comparing. In fact, the
odds are that I might not see similar problems in my setup as my iSCSI
initiator is a hardware card (the Intel 1000 ProT) that does its own
networking outside of xen. However, I will definitely let you know if
I see something strange.

Also, if you haven't done this already and feel that it might be
useful, I can try running netperf so see what kind of bandwidth I
observe.

Niraj


> It's possible that enabling CONFIG_NETFILTER by default was a
> mistake.
> 
> It's also possible that we've introduced some other more subtle
> performance bug :-(
> 
> Ian
> 
>


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