Stackable file systems and NFS

Try mounting with noac nfs mount option to disable attribute caching.

ac / noac

"Selects whether the client may cache file attributes. If neither
option is specified (or if ac is specified), the client caches file
attributes."

-Rajat

On Tue, Aug 14, 2012 at 3:51 PM, Mulyadi Santosa
[off-list ref] wrote:

Hi Ranjan...

On Tue, Aug 14, 2012 at 5:10 PM, Ranjan Sinha [off-list ref] wrote:

quoted

For now, /etc/export file has the following setting
*(rw,sync,no_root_squash)

hm, AFAIK that means synchronous method is selected. So,
theoritically, if there is no further data, the other end of NFS
should just wait.

Are you using blocking or non blocking read, btw? Sorry, i am not
really that good reading VFS code...

quoted

On client side we have not specified any options explicitly. This is
from /proc/mounts entry

quoted

rw,vers=3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys

hm, not sure, maybe in your case, read and write buffer should be
reduced so any new data should be transmitted ASAP. I was inspired by
bufferbloat handling, but maybe I am wrong here somewhere....


--
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

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