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[Xen-devel] Re: cs:21768 causes guest spend more time on boot up

To: "Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>
Subject: [Xen-devel] Re: cs:21768 causes guest spend more time on boot up
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Thu, 15 Jul 2010 13:22:35 +0100
Cc: "Xu, Jiajun" <jiajun.xu@xxxxxxxxx>, "Zhang, Jianwu" <jianwu.zhang@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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At 10:48 +0100 on 15 Jul (1279190937), Tim Deegan wrote:
> At 09:07 +0100 on 15 Jul (1279184841), Zhang, Yang Z wrote:
> >          In our recently nightly test, we find guest will cost more
> > time to boot up. After our investigation, we find that for rhel5u3 and
> > rh5u5 guest it will stop at ?start udev ? for long time when boot
> > up. And we find cs:21768 will cause this issue. Do you meet the same
> > problem?
> Nope, works fine for me[tm].  RHEL 5.5 stops at start_udev for about 5
> seconds, but that's not unusual.  I'll try RHEL 5.3.

I've reproduced this slowdown on CentOS 5.5 x64.  It seems to be caused
by the size of the SMBIOS tables - reverting the part of this cset that
adds a type 11 object fixes the boot time; then just making some of the
other SMBIOS strings longer causes it to hang again. I wonder whether
we're running into some other BIOS datastructure around 0xEB180


Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, XenServer Engineering
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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