From: Mats Petersson <mats.petersson@citrix.com>
To: xen-devel@lists.xen.org
Subject: Re: [PATCH] x86/time: fix scale_delta() inline assembly
Date: Mon, 26 Nov 2012 16:59:43 +0000 [thread overview]
Message-ID: <50B39FFF.6000209@citrix.com> (raw)
In-Reply-To: <CAF6-1L4++pq7nYVVHnOT-dV1tqPMFcJM1JVycMoKYBV6oehPJw@mail.gmail.com>
On 26/11/12 16:51, Sylvain Munaut wrote:
> I've just deployed this to a couple test servers that exhibited the problem.
>
> What I don't really understand is why are some HW affected and not others ?
I have no idea why some machines are more affected than others, but I
can clearly see what Jan is saying, and how it will cause "weird" things
to happen - but only if you hit the case where the calls are made in the
right pattern, which I think is a matter of "luck". It will probably
also matter what version of gcc is used to compile the code - different
compiler versions will use registers in different ways.
--
Mats
>
>
> Cheers,
>
> Sylvain
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
>
>
next prev parent reply other threads:[~2012-11-26 16:59 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-26 15:23 [PATCH] x86/time: fix scale_delta() inline assembly Jan Beulich
2012-11-26 16:10 ` Keir Fraser
2012-11-26 16:43 ` Dan Magenheimer
2012-11-26 16:51 ` Sylvain Munaut
2012-11-26 16:59 ` Mats Petersson [this message]
2012-11-26 17:03 ` Jan Beulich
2012-11-26 17:12 ` Dan Magenheimer
2012-11-26 19:23 ` Keir Fraser
2012-11-26 16:53 ` Jan Beulich
2012-11-26 16:31 ` Ian Campbell
2012-11-26 16:43 ` Jan Beulich
2012-11-26 17:12 ` Ian Campbell
2012-11-26 19:22 ` Keir Fraser
2012-11-26 16:50 ` Mats Petersson
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