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Hi, We installed about tens of
Fedora Core 1 machines, But then found that the FC1 NFS speed is greatly slow
down contrasted with our previous Redhat 8.0. Our FC1's nfs speed is now
at 6MB/s, while original Redhat 8.0's speed is at 10MB/s. For both operation
systems I did no special NFS tunings. Our Original environment RH8
environment is: Redhat 8.0, 2.4.20 vanilla kernel without "nfs over
tcp" support. Our current environment is:
Fedora Core 1, 2.4.25 vanilla kernel, with "nfs over tcp" kernel
support enabled. But it seems that the nfs
performance has no directly relationship with "nfs over tcp" in
kernel configuration. The reason is: I use both RH8|FC1 clients
to connect to FC1 nfs server, connections set to either "nfs over
udp" or "nfs over tcp", the speed is about the same, ranged from
6.09MB/s to 6.30MB/s. But from original RH8 nfs
clients to RH8 nfs servers, the speed is at 10MB-11MB/s, since I compiled no
"nfs over tcp" support for RH8 kernel, the nfs connection is based on
UDP traffic only. Personally I prefer
"nfs over tcp" feature enabled. Since tcp traffic is more reliable
and bring less trouble to Ops, even it is a little less efficient. I tried to increase the NFS
read/write size from 1024/1024, to 4096/4096, to 8192/8192, but that makes
almost no difference at all. Any suggestions/opinions on
why FC1's nfs performance is downgraded? Or I need to adjust any other parameters?
Thanks. --Guolin Cheng |
