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Re: [Qemu-block] [PATCH 5/5] qemu-img bench: Add --flush-interval

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH 5/5] qemu-img bench: Add --flush-interval
Date: Fri, 3 Jun 2016 17:16:21 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Am 03.06.2016 um 17:01 hat Denis V. Lunev geschrieben:
> On 06/03/2016 03:30 PM, Kevin Wolf wrote:
> >This options allows to flush the image periodically during write tests.
> >
> >Signed-off-by: Kevin Wolf <address@hidden>
> This pattern could be a bit different - you wait requests to finish
> and after that start flush. In this case there is no gain with my
> patch ;)
> You should treat flush as ordinary write request i.e. place
> request immediately without waiting for writes to finish.
> May be this could be specified as an operation mode.

Hm, okay, I can try that.

What OS is running on your guest? Because I seem to remember that Linux
drains the queue before sending a flush command. This is why I
implemented it this way here. Maybe it changed in Linux, though.


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