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xen-devel
Re: [GIT/PATCH 0/5] Re: [Xen-devel] unfair servicing of DomU vbd request
On 3/3/2011 9:09 AM, Ian Campbell wrote:
On Thu, 2011-03-03 at 08:30 +0000, Keir Fraser wrote:
> Without the round-robin servicing, unfairness to the point of starvation is
> a distinct possibility.
Indeed. The following is a forward port of these patches from
2.6.18-xen.hg:
Thanks for working on this, Ian.
I think that this has affected me several times, as I've noticed these
symptoms before (heavy disk access by a few domains, followed by several
Windows domUs mysteriously rebooting) -- as recently as Wednesday, in
fact. The I/O from rebooting domUs, unfortunately, makes everything even
worse, often leading to further Windows domUs crashing.
I look forward to this being merged into stable-2.6.32. In the meantime,
I'll monkey around with git as you described and try to get a local
version working. I'm itching to test it out, since this also might
explain some of the occasional the longish disk delays that I see on
machines with a medium I/O load (in which the dom0 still responds
normally, but one of the domUs frequently stalls waiting for I/O).
-John
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