From: Linda Walsh <xfs@tlinx.org>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH] mkfs: default to CRC enabled filesystems
Date: Thu, 19 Mar 2015 19:27:25 -0700 [thread overview]
Message-ID: <550B858D.4030003@tlinx.org> (raw)
In-Reply-To: <1426720967-8215-1-git-send-email-david@fromorbit.com>
Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> It's time to change the mkfs defaults to enable CRCs for all new
> filesystems.
---
"Sounds good", but what exactly is CRC'ed?
I.e. all data? Or how much data/second would I expect
to 'need' CRC'ing?
Some quick timing stuff:
> time dd if=/dev/zero of=1G bs=1M count=1024 oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 1.76947 s, 607 MB/s
1.77sec 0.00usr 0.50sys (28.38% cpu)
> dropcaches
76.34sec 0.00usr 69.22sys (90.69% cpu)
Ishtar:law/bin> time crc32 1G ## no cache
5B64C2B0
6.67sec 3.85usr 0.94sys (71.82% cpu)
> time crc32 1G ## in cache
5B64C2B0
4.00sec 3.57usr 0.42sys (100.00% cpu)
(using Xeon X5660 @ 2.80GHz)
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next prev parent reply other threads:[~2015-03-20 2:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-18 23:22 [PATCH] mkfs: default to CRC enabled filesystems Dave Chinner
2015-03-19 14:55 ` Eric Sandeen
2015-03-19 14:58 ` Eric Sandeen
2015-03-19 23:13 ` Dave Chinner
2015-03-20 15:26 ` Eric Sandeen
2015-03-20 21:47 ` Dave Chinner
2015-03-20 21:56 ` Eric Sandeen
2015-03-20 2:27 ` Linda Walsh [this message]
2015-03-20 2:44 ` Greg Freemyer
2015-03-20 18:38 ` Darrick J. Wong
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