From: Dave Chinner <david@fromorbit.com>
To: Jens Axboe <axboe@fb.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-block@vger.kernel.org
Subject: Re: [PATCHSET v3][RFC] Make background writeback not suck
Date: Fri, 1 Apr 2016 16:04:12 +1100 [thread overview]
Message-ID: <20160401050411.GW11812@dastard> (raw)
In-Reply-To: <56FDEB1A.2030404@fb.com>
On Thu, Mar 31, 2016 at 09:29:30PM -0600, Jens Axboe wrote:
> On 03/31/2016 06:56 PM, Dave Chinner wrote:
> >I'm not changing the host kernels - it's a production machine and so
> >it runs long uptime testing of stable kernels. (e.g. catch slow
> >memory leaks, etc). So if you've disabled throttling in the guest, I
> >can't test the throttling changes.
>
> Right, that'd definitely hide the problem for you. I'll see if I can
> get it in a reproducible state and take it from there.
>
> On your host, you said it's SCSI backed, but what does the device look like?
HW RAID 0 w/ 1GB FBWC (dell h710, IIRC) of 2x200GB SATA SSDs
(actually 256GB, but 25% of each is left as spare, unused space).
Sustains about 35,000 random 4k write IOPS, up to 70k read IOPS.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2016-04-01 5:04 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-30 15:07 [PATCHSET v3][RFC] Make background writeback not suck Jens Axboe
2016-03-30 15:07 ` [PATCH 1/9] writeback: propagate the various reasons for writeback Jens Axboe
2016-03-30 15:07 ` [PATCH 2/9] writeback: add wbc_to_write() Jens Axboe
2016-03-30 15:07 ` [PATCH 3/9] writeback: use WRITE_SYNC for reclaim or sync writeback Jens Axboe
2016-03-30 15:07 ` [PATCH 4/9] writeback: track if we're sleeping on progress in balance_dirty_pages() Jens Axboe
2016-04-13 13:08 ` Jan Kara
2016-04-13 14:20 ` Jens Axboe
2016-03-30 15:07 ` [PATCH 5/9] block: add ability to flag write back caching on a device Jens Axboe
2016-03-30 15:42 ` Christoph Hellwig
2016-03-30 15:46 ` Jens Axboe
2016-03-30 16:23 ` Jens Axboe
2016-03-30 17:29 ` Christoph Hellwig
2016-03-30 15:07 ` [PATCH 6/9] sd: inform block layer of write cache state Jens Axboe
2016-03-30 15:07 ` [PATCH 7/9] NVMe: " Jens Axboe
2016-03-30 15:07 ` [PATCH 8/9] block: add code to track actual device queue depth Jens Axboe
2016-03-30 15:07 ` [PATCH 9/9] writeback: throttle buffered writeback Jens Axboe
2016-03-31 8:24 ` [PATCHSET v3][RFC] Make background writeback not suck Dave Chinner
2016-03-31 14:29 ` Jens Axboe
2016-03-31 16:21 ` Jens Axboe
2016-04-01 0:56 ` Dave Chinner
2016-04-01 3:29 ` Jens Axboe
2016-04-01 3:33 ` Jens Axboe
2016-04-01 3:39 ` Jens Axboe
2016-04-01 6:16 ` Dave Chinner
2016-04-01 14:33 ` Jens Axboe
2016-04-01 5:04 ` Dave Chinner [this message]
2016-04-01 0:46 ` Dave Chinner
2016-04-01 3:25 ` Jens Axboe
2016-04-01 6:27 ` Dave Chinner
2016-04-01 14:34 ` Jens Axboe
2016-03-31 22:09 ` Holger Hoffstätte
2016-04-01 1:01 ` Dave Chinner
2016-04-01 16:58 ` Holger Hoffstätte
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