Re: [Xen-devel] frontend not being notified about packets received? - Ralph Passgang - com.xensource.lists.xen-devel

4 messages in com.xensource.lists.xen-develRe: [Xen-devel] frontend not being no...

From	Sent On	Attachments
James Harper	29 Dec 2007 03:55
Ralph Passgang	29 Dec 2007 07:24
James Harper	29 Dec 2007 19:35
Mark Williamson	30 Dec 2007 04:37

Subject:	Re: [Xen-devel] frontend not being notified about packets received?
From:	Ralph Passgang (ral...@debianbase.de)
Date:	12/29/2007 07:24:40 AM
List:	com.xensource.lists.xen-devel

Am Samstag, 29. Dezember 2007 12:56:13 schrieb James Harper:

I'm working on the windows xen pv drivers in Andy's absence, and am noticing a strange behaviour... I'm not getting a notification of packets received until there are lots of them, then I get them all at once, but up to a minute or so later if there isn't much activity.

I have tinkered with setting "feature-rx-notify" to zero and one, and omitting it altogether, but it doesn't appear to change anything.

Any hints would be greatly appreciated. I'm using the latest Debian 2.6.18 packages from Etch, and Xen 3.1.1.

Just a hint: The debian 2.6.18-5-xen packages are made with patches from xen 3.0 and not with a more recent 3.1 patch.

I am not familiar enough with the xen internals to say if this could be the problem, but maybe you should compile 2.6.18 with a more recent xen patch to see if the problem still exists then.

btw.: I tried your xen pv drivers (v0.5) on win xp 32bit. They are working very well. They are not really faster, but at least they reduce the load in dom0 a lot on heavy IO in the hvm guest. So after optimising them for speed, they really could be usefull for all win hvm setups.

Some things I noticed: you need a hvm domain with apic/acpi enabled (haven't checked which one is really required), because without apic/acpi the pv drivers will generate a blue screen at boot time.

So keep the good work up! I really like to see open source pv drivers for windows! Let me know if it helps you to see some benchmarks on the harddisk performance.

--Ralph

Thanks