Re: [Xen-devel] [win-pv-devel] Question about windows domU long boot time in xen and help for update libxl virtio patch (for a test)

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 08/05/2015 16:59, Paul Durrant ha scritto:
> > -----Original Message-----
> > From: win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx [mailto:win-pv-devel-
> > bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Fabio Fantoni
> > Sent: 08 May 2015 15:54
> > To: xen-devel; win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> > Cc: Anthony Perard; Wei Liu; Ian Campbell; Stefano Stabellini
> > Subject: [win-pv-devel] Question about windows domU long boot time in
> > xen and help for update libxl virtio patch (for a test)
> >
> > In latest years hvm domUs support and performance was increased but
> > windows boot time is still too long.
> > I tried out all sort of combinations (without pv, with old gplpv and new
> > winpv, with vnc, spice or without both, with different vgas and many
> > other options) with same result: strange long boot time (before arrive
> > to user login).
> > On kvm (trying with same qemu/seabios versions, qdisk with raw ecc...)
> > instead for example the boot time is faster and similar to the phisical
> > pc one with same vcpu ram ecc as assigned.
> > Is there something that need to be improved/fixed in windows pv drivers
> > or xen?
> Which version of QEMU are you using. I tend to use upstream, but I see a *very* 
> long pause between the end of firmware logging and sampling the viridian cpuid 
> leaves (which is generally the next thing to cause some logging) so my 
> suspicion is that the int13 handling in seabios is probably the culprit. That's 
> only a hunch, but using rombios and qemu trad is quite a lot faster.
Thanks for reply.
With qemu-trad if I remember good was faster on initial boot but have 
lower general performance, I don't use anymore qemu-trad on dom0 with 
xen >= 4.3
About qemu upstream I started use it on 1.2 if I remember good and after 
I always tested all versions up to 2.2 and seabios I keeped updated 
rebuilding from debian sid package (now 1.8.1)
> Once the kernel starts to boot I see no significant delays. PV drivers are not 
> wonderfully fast to start up as the xenstore state dance does take a while. It 
> is somewhat unavoidable though.
>
>    Paul
>
> > I tried to narrow down my search trying with virtio disk on xen but I
> > was unable to have libxl patch working.
> > I taken very old Wei Liu patch from here:
> > http://downloads.xen.org/Wiki/VirtioOnXen/libxl-virtio-support.patch
> >
> > And I tried to adapt it but there is something that I not understand and
> > causing the build fails:
> > libxl.c:2339:32: error: LIBXL__DEVICE_KIND_VIRTIO undeclared (first use
> > in this function)
> >
> > Here the path I updated and tried failing, I did only disks part (nic
> > need only model change in xl.cfg FWIK):
> > https://github.com/Fantu/Xen/commit/783c1739df3a87689ab8c152632b2493
> > 34d92f0a
> >
> > Can someone help me to complete/fix it please?
> >
> >
> > Thanks for any reply and sorry for my bad english.
> >
> >
> > _______________________________________________
> > win-pv-devel mailing list
> > win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> > http://lists.xenproject.org/cgi-bin/mailman/listinfo/win-pv-devel

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