Subject: FFS slowness
To: None <email@example.com>
From: Ivan Kanis <firstname.lastname@example.org>
Date: 12/22/2005 16:03:14
I am seeing poor performance with FFS + softdep.
My machine is an AMD Opteron and it is connected to a SCSI disk
with an Adaptec 7902 Ultra320 Wide card.
The problem in a nutshell is that I am getting 1/4 of the perfomance
when copying a directory compar to copying a big file.
For example copying the /usr directory:
amd64:/# time cp -r /usr /usr.bak
amd64:/# du -sh /usr
Copying a big ISO file:
amd64:/tmp# time cp big.iso big.iso.bak
amd64:/tmp# ls -lh big.iso
-rw-r--r-- 1 root wheel 635M Dec 22 15:18 big.iso
Since copying a single file is pretty fast it rules out an I/O problem
with the disk. Does anybody knows what causes the slowness? Any ideas
Senior Software Developer
Tadpole Computer Limited
Tel: +44 (0) 870 432 4161
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