From: Waiman Long <waiman.long@hp.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Jason Low <jason.low2@hp.com>, Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, Davidlohr Bueso <davidlohr@hp.com>,
Scott J Norton <scott.norton@hp.com>
Subject: Re: [PATCH 2/7] locking/rwsem: more aggressive use of optimistic spinning
Date: Mon, 18 Aug 2014 18:48:46 -0400 [thread overview]
Message-ID: <53F282CE.5030205@hp.com> (raw)
In-Reply-To: <20140817234152.GC26465@dastard>
On 08/17/2014 07:41 PM, Dave Chinner wrote:
> On Fri, Aug 15, 2014 at 01:58:09PM -0400, Waiman Long wrote:
>> On 08/14/2014 11:34 PM, Dave Chinner wrote:
>>> <create sparse vm image file of 500TB on ssd with XFS on it>
>>> xfs_io -f -c "truncate 500t" -c "extsize 1m" /path/to/vm/image/file
> ....
>> Thank for the testing recipe. I am afraid that I can't find a 500TB
>> SSD for testing purpose.
> Which bit of "sparse vm image file" didn't you understand? I'm
> using a 400GB of SSD for this testing....
>
> $ df -h /mnt/fast-ssd
> Filesystem Size Used Avail Use% Mounted on
> /dev/sdf 400G 275G 125G 69% /mnt/fast-ssd
> $ ls -lh /mnt/fast-ssd/vm-500t.img
> -rw------- 1 root root 500T Aug 15 13:21 /mnt/fast-ssd/vm-500t.img
> $ du -sh /mnt/fast-ssd/vm-500t.img
> 275G /mnt/fast-ssd/vm-500t.img
>
> That is on a Samsung 840 EVO SSD, which just about everyone should
> be able to obtain. Do you *really* think I have 500TB of SSDs lying
> around?
>
> Cheers,
>
> Dave.
I am sorry that I misunderstood your instruction. I am not a filesystem
guy and haven't run this kind of test before.
Thank for the clarification.
-Longman
next prev parent reply other threads:[~2014-08-18 22:48 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-04 2:36 [PATCH 0/7] locking/rwsem: enable reader opt-spinning & writer respin Waiman Long
2014-08-04 2:36 ` [PATCH 1/7] locking/rwsem: don't resched at the end of optimistic spinning Waiman Long
2014-08-04 7:55 ` Peter Zijlstra
[not found] ` <20140804075528.GI9918-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2014-08-04 18:36 ` Waiman Long
2014-08-04 18:36 ` Waiman Long
2014-08-04 20:48 ` Peter Zijlstra
2014-08-04 21:12 ` Jason Low
2014-08-05 17:54 ` Waiman Long
2014-08-05 17:54 ` Waiman Long
[not found] ` <1407119782-41119-1-git-send-email-Waiman.Long-VXdhtT5mjnY@public.gmane.org>
2014-08-04 2:36 ` [PATCH 2/7] locking/rwsem: more aggressive use " Waiman Long
2014-08-04 2:36 ` Waiman Long
2014-08-04 4:09 ` Davidlohr Bueso
[not found] ` <1407119782-41119-3-git-send-email-Waiman.Long-VXdhtT5mjnY@public.gmane.org>
2014-08-04 4:10 ` Jason Low
2014-08-04 4:10 ` Jason Low
2014-08-04 15:44 ` Waiman Long
2014-08-13 5:51 ` Dave Chinner
2014-08-13 16:41 ` Waiman Long
2014-08-15 3:34 ` Dave Chinner
2014-08-15 17:58 ` Waiman Long
2014-08-16 7:40 ` Mike Galbraith
2014-08-17 23:41 ` Dave Chinner
2014-08-18 22:48 ` Waiman Long [this message]
2014-08-04 4:25 ` [PATCH 0/7] locking/rwsem: enable reader opt-spinning & writer respin Davidlohr Bueso
2014-08-04 4:25 ` Davidlohr Bueso
[not found] ` <1407126313.3216.10.camel-5JQ4ckphU/8SZAcGdq5asR6epYMZPwEe5NbjCUgZEJk@public.gmane.org>
2014-08-04 18:07 ` Waiman Long
2014-08-04 18:07 ` Waiman Long
2014-08-04 2:36 ` [PATCH 3/7] locking/rwsem: check for active writer/spinner before wakeup Waiman Long
[not found] ` <1407119782-41119-4-git-send-email-Waiman.Long-VXdhtT5mjnY@public.gmane.org>
2014-08-04 21:20 ` Jason Low
2014-08-04 21:20 ` Jason Low
2014-08-05 17:56 ` Waiman Long
2014-08-05 17:56 ` Waiman Long
2014-08-04 2:36 ` [PATCH 4/7] locking/rwsem: threshold limited spinning for active readers Waiman Long
[not found] ` <1407119782-41119-5-git-send-email-Waiman.Long-VXdhtT5mjnY@public.gmane.org>
2014-08-05 4:54 ` Davidlohr Bueso
2014-08-05 4:54 ` Davidlohr Bueso
2014-08-05 5:30 ` Davidlohr Bueso
[not found] ` <1407216632.2566.22.camel-5JQ4ckphU/8SZAcGdq5asR6epYMZPwEe5NbjCUgZEJk@public.gmane.org>
2014-08-05 5:41 ` Davidlohr Bueso
2014-08-05 5:41 ` Davidlohr Bueso
2014-08-05 18:14 ` Waiman Long
2014-08-04 2:36 ` [PATCH 5/7] locking/rwsem: move down rwsem_down_read_failed function Waiman Long
2014-08-04 2:36 ` [PATCH 6/7] locking/rwsem: enables optimistic spinning for readers Waiman Long
2014-08-04 2:36 ` [PATCH 7/7] locking/rwsem: allow waiting writers to go back to optimistic spinning Waiman Long
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