Hi,
I am running 2.6.25 kernel on a [4 way, 3.2 x86_64, 4GB] system. The test
is doing I/O on a local ext3 filesystem, and measuring the bandwidth, and
then NFS mounting the filesystem loopback on the same system. I have
configured 64 nfsd's to run. The test script is attached at the bottom.
My configuration is:
/dev/some-local-disk : /local
NFS mount /local : /nfs
The result is:
200 processes:
/local: 108000 KB/s
/nfs: 66000 KB/s: Drop of 40%
300 processes (KB/s):
/local: 112000 KB/s
/nfs: 57000 KB/s: Drop of 50%
I am not using any tuning, though I have tested with both
sunrpc.tcp_slot_table_entries=16 & 128
Is this big a drop expected for a loopback NFS mount? Any
feedback/suggestions are very
appreciated.
Thanks,
- KK
(See attached file: nfs)Attachment:
nfs
Description: Binary data
