linux-kernel - Re: [PATCHSET] blk-throttle: implement proper hierarchy support

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Message-ID: <20130503185815.GB22860@mtj.dyndns.org>
Date:	Fri, 3 May 2013 11:58:15 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, lkml <linux-kernel@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>,
	containers@...ts.linux-foundation.org,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCHSET] blk-throttle: implement proper hierarchy support

On Fri, May 03, 2013 at 11:57:51AM -0700, Tejun Heo wrote:
> On Fri, May 03, 2013 at 01:56:52PM -0400, Vivek Goyal wrote:
> > > Yeah, I think that's what *should* be happening but not what I'm
> > > seeing.  I'm seeing ~15% penalty.
> > 
> > What test are you running. I am running a simple dd with directIO and
> > I am not seeing any penalty.
> 
> Combination of dd and a test program that I've been using for some
> while which can generate concurrent direct random IOs.  Attaching the
> source code for the latter.

And actually attaching...

-- 
tejun

View attachment "test_rawio.c" of type "text/plain" (5825 bytes)