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Re: [Xen-devel] [linux-linus test] 17926: regressions - FAIL

On Thu, May 09, 2013 at 03:52:47PM +0100, xen.org wrote:
> flight 17926 linux-linus real [real]
> http://www.chiark.greenend.org.uk/~xensrcts/logs/17926/
> Regressions :-(
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-i386-xl-credit2   10 guest-saverestore         fail REGR. vs. 
> 12557
>  test-amd64-i386-xl           10 guest-saverestore         fail REGR. vs. 
> 12557
>  test-amd64-i386-rhel6hvm-amd  7 redhat-install            fail REGR. vs. 
> 12557
>  test-amd64-i386-pair   17 guest-migrate/src_host/dst_host fail REGR. vs. 
> 12557

So this is interesting. I noticed that even a local save/restore of any
guest when the host is 32-bit is taking forever. While with a 64-bit host
is done much much faster. (Tens of minutes vs minutes)

Just running 'perf record xm save' showed me that it spends the majority
of time doing the xen_version hypercall (so yield to hypervisor). Hadn't really
dug deeper in this to see if there are some other operations (so block I/Os)
that are just soo much slower on i386 than 64-bit.

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