From: Michael Tokarev <mjt@tls.msk.ru>
To: qemu-devel@nongnu.org, debian-admin@lists.debian.org
Cc: Marcelo Tosatti <mtosatti@redhat.com>, Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] Steal time MSR not set properly during live migration?
Date: Fri, 12 Jun 2015 00:42:02 +0300 [thread overview]
Message-ID: <557A00AA.2060800@msgid.tls.msk.ru> (raw)
In-Reply-To: <20150611204616.GB19602@marvin.ws.skroutz.gr>
11.06.2015 23:46, Apollon Oikonomopoulos wrote:
> On 15:12 Wed 03 Jun , Apollon Oikonomopoulos wrote:
>> Any ideas?
>
> As far as I understand, there is an issue when reading the MSR on the
> incoming side: there is a KVM_SET_MSRS vcpu ioctl issued by the main
> thread during initialization, that causes the initial vCPU steal time
> value to be set using the main thread's (and not the vCPU thread's)
> run_delay. Then, upon resuming execution, kvm_arch_load_vcpu uses the
> vCPU thread's run_delay to determine steal time, causing an overflow.
> The issue was introduced by commit
> 917367aa968fd4fef29d340e0c7ec8c608dffaab.
>
> For the full analysis, see https://bugs.debian.org/785557#64 and the
> followup e-mail.
Adding Cc's...
Thanks,
/mjt
next prev parent reply other threads:[~2015-06-11 21:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-03 12:12 [Qemu-devel] Steal time MSR not set properly during live migration? Apollon Oikonomopoulos
2015-06-11 20:46 ` Apollon Oikonomopoulos
2015-06-11 21:42 ` Michael Tokarev [this message]
2015-08-28 14:57 ` Alexandre DERUMIER
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