Dave Chinner wrote:
From: Dave Chinner <dchinner@xxxxxxxxxx>
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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