Samba server performance -- only 33MiB/s with one client on 1G network!
Lev Serebryakov
lev at FreeBSD.org
Sun Jul 7 19:37:14 UTC 2013
Hello, Freebsd-performance.
I have 9-STABLE/amd64 server on E4500 CPU (Core2Duo 2.4Ghz), with 6GiB of
DDR2-800 RAM and intel 1G adapter (em0, "82566DM-2 Gigabit Network
Connection").
It has SATA software RAID5 with 5 drives.
Filesystem (UFS2, 32K blocks) is exported with samba36 (latest), with
enabled AIO, sendfile and TCP options for 256K window (SMB2 is turned off,
as Win7 clients has confirmed, but not fixed bug in it).
Local read of directory like this:
tar cf - "dir" | dd bs=128k of=/dev/null
shows 280MiB/s read according to "dd" diagnostics. It is about 24GiB of
data, so it could not be cached. Good result, I like it.
This server is connected to small home netwrok via HP ProCurve 1400-8G
switch.
Also, I have client, which is connected to same switch and runs Win 7. It
mounts this FS via Samba.
iperf from server to Win7 client (Server sends) shows ~820 Mbits/sec. It
is not best performanse, but client has loosy network adapter (Atheros 1G
adapter).
But when I run
tar cf - "dir" | dd bs=128k of=/dev/null
on client it shows only 33MiB/s. It doesn't look like something near
820Mbit/s!
And smbd utilize only 50% of one core.
So, smbd is NOT limited by:
(1) FS (33MiB/s vs 280MiB/s).
(2) Network (33MiB/s vs 820Mbit/s / 97MiB/s).
(3) CPU (50% vs 100%, CPU is 150% idle!).
Why samba performacne is so loosy? What could
--
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>
More information about the freebsd-performance
mailing list