Mikhail Goriachev wrote:
Pavel Duda wrote:
Hello,
I've recently bought new big HDD (WDC RE, 320GB) and it looks like
FreeBSD has some troubles with it when trying to transfer files over
network.
If I try to perform some "synthetic" test like 'dd if=/dev/zero
of=/wdc320/testfile' then I get some decent speeds about 40MB/s. When I
try to copy some big files from my older disk (IBM 40GB) I still have
write about 25-27MB/s.
Problem comes when I try to copy something to disk over network (tried
samba, ftp) disk write speed is very low - about 5-6MB/s at max.
When testing this issue I've start 'systat -vmstat 1' and noticed that
my new disk is very busy (60-100%) and speed (MB/s) jumps up and down.
If I write files with 'dd' or transfer them from disk 2 disk then write
speed and disk load is almost constant (about 60%). When transfering
files over network to old HDD then disk load is low (40-50%) and speed
is constant (8-9MB/s).
To be sure that disk it is not some kind of disk problem I've installed
Debian 3.1r2 with same version of samba and I get 9-11MB/s transfer
speeds (in both directions) !!
Also it doesn't matter if I use transfer data over gigabit card or
100mbit card. Results are similar. FreeBSD is in avarage very very slow
(3MB) while Debian works fine (10MB). Because my server is primarily
used for transfer files (Samba + PDC) it is crucial for me to have
highest transfer speeds possible and I'd like to stick with FreeBSD :-/.
Does someone has any idea what could be wrong or how could I determine
what causes this problem ?
Hi,
This effect is normal since you're transferring files over relatively
slow network. The speed through 100Mb/s Ethernet will be around 5 or
6MB/s and probably you can't go any faster due to your hardware
limitations (switch, cables, processor, controllers and especially their
drivers).
Currently there are a few active threads related to similar issues
(controllers and their drivers). You might be interested in following them:
http://lists.freebsd.org/pipermail/freebsd-questions/2006-June/123577.html
http://lists.freebsd.org/pipermail/freebsd-questions/2006-June/123588.html
http://lists.freebsd.org/pipermail/freebsd-questions/2006-June/123673.html
Cheers,
Mikhail.
Hmmm so how you explain that with Debian system on SAME machine I'm ABLE
to get transfer speeds about 10MB/s ?? Or do you mean I can't go faster
with FreeBSD and only solution is switch to Linux ??
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