Coda File System

Re: write speed

From: Greg Troxel <gdt_at_ir.bbn.com>
Date: 31 Jan 2003 08:32:05 -0500
I have been having write speed problems as well that seem odd.

I just did:

gdt 23 ~/%co > time dd if=/dev/zero of=foo bs=32k count=32
32+0 records in
32+0 records out
1048576 bytes transferred in 0.116 secs (9039448 bytes/sec)
real    0m51.396s
user    0m0.002s
sys     0m0.014s

All the time was in waiting after the dd finished, while the store was
in process.  Network traffic seems to be flowing.

Other clients don't have that much trouble.  Very oddly, the trouble
persists on my workstation, even though I went from a P6-200/FreeBSD
to a PIII-933/NetBSD!  But it may be that others are almost always
W-D.

On a Sparc 5 (NetBSD) in connected mode on a different campus things
seem more reasonable (1 MB in 6 s is ~1.3 Mb/s -the sparc is on  a 10
Mb/s busy ethernet):

~/%co > time dd if=/dev/zero of=bar bs=32k count=32
32+0 records in
32+0 records out
1048576 bytes transferred in 1 secs (1048576 bytes/sec)

real    0m6.358s
user    0m0.003s
sys     0m0.100s



Note that I am using transport-mode IPsec as usual.

        Greg Troxel <gdt_at_ir.bbn.com>
Received on 2003-01-31 08:34:51