qemu-block
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-block] [PATCH 0/3] mirror: Fix guest responsiveness during bit


From: Fam Zheng
Subject: Re: [Qemu-block] [PATCH 0/3] mirror: Fix guest responsiveness during bitmap scan
Date: Fri, 10 Jul 2015 14:43:50 +0800
User-agent: Mutt/1.5.23 (2014-03-12)

On Thu, 07/09 14:02, Stefan Hajnoczi wrote:
> This patch only converts the mirror block job to use the new relax
> function.  The other block jobs (stream, backup, commit) are still using
> a 0 ns delay and are therefore broken.  They should probably be
> converted in the same series.

That's because they all can be perfectly mitigated by setting a reasonable
"speed" that matchs the host horsepower. Thinking about this again, I doubt
that lengthening the duration with a hardcoded value benifits everyone; and
before Alexandre's reply on old server/slow disks, I don't recall any report,
because the coroutines would already yield often enough, when waiting for IO to
complete. So I am not sure whether they're broken in practice.

Fam



reply via email to

[Prev in Thread] Current Thread [Next in Thread]