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author | Tiezhu Yang <kernelpatch@126.com> | 2016-06-17 09:40:02 +0800 |
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committer | Jonathan Corbet <corbet@lwn.net> | 2016-06-23 08:08:36 -0600 |
commit | a37376f32687cb4043e72f5f761df5cc52e08073 (patch) | |
tree | fa2779cb363661a8ee5add61862dd98539396d0a /Documentation/usb | |
parent | c0b8c9a3447ad379869f21884b86ec97c7b8db7a (diff) | |
download | linux-a37376f32687cb4043e72f5f761df5cc52e08073.tar.gz linux-a37376f32687cb4043e72f5f761df5cc52e08073.tar.bz2 linux-a37376f32687cb4043e72f5f761df5cc52e08073.zip |
Documentation: fix wrong value in md.txt
In the current Documentation/md.txt, the lower limit value of
stripe_cache_size is 16 and the default value is 128, but when
I update kernel to the latest mainline version and RAID5 array
is created by mdadm, then execute the following commands, it
shows an error and a difference respectively.
1) set stripe_cache_size to 16
[root@localhost ~]# echo 16 > /sys/block/md0/md/stripe_cache_size
bash: echo: write error: Invalid argument
2) read the default value of stripe_cache_size
[root@localhost ~]# cat /sys/block/md0/md/stripe_cache_size
256
I read drivers/md/raid5.c and find the following related code:
1) in function 'raid5_set_cache_size':
if (size <= 16 || size > 32768)
return -EINVAL;
2) #define NR_STRIPES 256
So the lower limit value of stripe_cache_size should be 17 and
the default value should be 256.
Signed-off-by: Tiezhu Yang <kernelpatch@126.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/usb')
0 files changed, 0 insertions, 0 deletions