Re: [RFC][Resend] Make NFS-Client readahead tunable

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

On Thu, 2008-09-18 at 01:38 -0700, Martin Knoblauch wrote:

>  I believe Peter wanted to add per bdi stuff for nfs some time ago. Not sure what came out of it.

$ mount localhost:/ /mnt/tmp
$ grep nfs /proc/$$/mountinfo
21 17 0:17 / /var/lib/nfs/rpc_pipefs rw - rpc_pipefs rpc_pipefs rw
31 13 0:20 / /proc/fs/nfsd rw - nfsd nfsd rw
37 17 0:22 / /mnt/tmp rw - nfs localhost:/ rw,vers=3,rsize=65536,wsize=65536,namlen=255,hard,nointr,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=127.0.0.1,mountvers=3,mountproto=tcp,addr=127.0.0.1
$ ls -la /sys/class/bdi/0\:22/
total 0
drwxr-xr-x  3 root root    0 2008-09-18 15:16 .
drwxr-xr-x 21 root root    0 2008-09-18 15:16 ..
-rw-r--r--  1 root root 4096 2008-09-18 15:19 max_ratio
-rw-r--r--  1 root root 4096 2008-09-18 15:19 min_ratio
drwxr-xr-x  2 root root    0 2008-09-18 15:19 power
-rw-r--r--  1 root root 4096 2008-09-18 15:19 read_ahead_kb
lrwxrwxrwx  1 root root    0 2008-09-18 15:19 subsystem -> ../../bdi
-rw-r--r--  1 root root 4096 2008-09-18 15:19 uevent
$ cat /sys/class/bdi/0\:22/read_ahead_kb
960