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Re: [Xen-users] GPL PV drivers for Windows 0.9.11-pre12

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] GPL PV drivers for Windows 0.9.11-pre12
From: Joost van den Broek <jvandenbroek@xxxxxxxxx>
Date: Tue, 26 Aug 2008 14:21:05 +0200
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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James Harper schreef:
If you could please re-test with -pre13 and Large Send enabled again it
would be useful. If that goes at full speed then I don't really need the
info from xenstore-ls, but if it goes slowly again I would appreciate
the xenstore-ls info.

It may be that your netback is telling the drivers that large send is
unsupported but that I'm activating it anyway, which may well result in
a slowdown.

Thanks

James
Ah well, I tested both Large Send enabled and disabled on pre13, but didn't disable it on pre12. So the answer would be that there is indeed a problem with the Large Send Offload on my system. Iirc I'm using the same system as yours, a ML110 with Broadcom NIC on-board. Based on your test results, this one should work well.

Strange thing is when I do a xenstore-ls, I get this message back:
/usr/sbin/xenstore-ls: line 6: /usr/lib/xen-3.2-1/bin/xenstore-ls: No such file or directory /usr/sbin/xenstore-ls: line 6: exec: /usr/lib/xen-3.2-1/bin/xenstore-ls: cannot execute: No such file or directory

Looking in /usr/lib/xen-3.2-1/bin, I find many files, including seven beginning with xenstore-... But no xenstore-ls. How could that be? I'm using Xen 3.2.1 on Debian Etch 4.0 with kernel 2.6.18-6-xen-686. This is the Etch Xen stock kernel, maybe it needs to be upgraded? What kernel are you running?

I just tried 'ethtool -k peth0', which says the following: "Cannot get device udp large send offload settings: Operation not supported". So I suppose that confirms your assumption about the unsupported large send offload, but yours, thus the same card, supports it?

Joost

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