Bug 178624 – app-emulation/xen-3.0.4 - Large procesor usage for Windows 2003 Server DomU when vcpu more than 2

• Product: Gentoo Linux
• Status: RESOLVED TEST-REQUEST

[Description Bartlomiej Dubas 2007-05-15 12:25:31 UTC]

Hi,

I isntall and configure gentoo 2007 with Xen 3.0.4 avaiable in the protage tree. I have the problem with Windows 2003 Eneterprise Edition as domU. If i give 4 vcpus for such quest after system starts xentop schow that it use almoust all procesor resorces asigned to it (350-400%) even if inside the quest i don't perfrom any operation. When i asign 2 vcpus everything wirk ok... Windows runs, going up and after it the procesor usage in top xen is normal (1-5%).

I perform tests on 32bit windos as wel as 64bit windows version. On the 32bit i found osme workeround that seams to work. I install PV drivers packkage form XenExpress 3.2 instalation CD and thenus the new PV option in the boot menu. I also notice (as well for 32bit windows) that if i change the vcpu from 4 to 2 install SP2 for windows 2003 and then back to 4 vcpu the system is hanging while botting (just before che switch from splash to the login screen) and it takes about 300% cpu time in xentop. Even safe mode don't help. But if i conect via vnc to the quest before it run operating system (BIOS screen) and wait until system starts its working but not always.

While i notice that 64bit version of Widnows runs better than 32bit version (better disk and network performance) i want to use 64bit.

[Comment 1 Bartlomiej Dubas 2007-05-15 12:26:58 UTC]

Created attachment 119353 [details]
I atachemnt i put my configuration taken form emerge info

[Comment 2 Alex Howells (RETIRED) 2007-05-15 17:12:02 UTC]

Is this problem specific to Gentoo, or is it reproducible on Debian/Ubuntu?

[Comment 3 Bartlomiej Dubas 2007-05-16 12:05:34 UTC]

(In reply to comment #2)
> Is this problem specific to Gentoo, or is it reproducible on Debian/Ubuntu?

I only use gentoo so i dont know how its look like on the other distributions. I also check openSuse 10.2 wicth have xen 3.0.3 (from Box) but becouse the SMP Windwos quests are suported since XEN 3.0.4 i don;t have chance to see this problems.

[Comment 4 Micheal Marineau (RETIRED) 2007-08-26 23:58:24 UTC]

xen 3.1.0 is now in portage, does it resolve this issue?

[Comment 5 Robert Buchholz (RETIRED) 2008-08-29 15:25:51 UTC]

This issue does not sounds specific to Gentoo. Please reopen if you can reproduce with recent versions of Gentoo in Gentoo, and also contact upstream if you can.