Re: fxp performance with POLLING

On Mon, Oct 06, 2008 at 09:02:33AM +0200, Bartosz Stec wrote:
Alfred Perlstein wrote:
* Bartosz Stec <admin@xxxxxxx> [081003 07:23] wrote:

Hello again :)

With POLLING enabled I experience about 10%-25% performance drop when
copying files over network. Tested with both SAMBA and NFS. Is it
normal?

FreeBSD 7.1-PRERELEASE #0: Sat Sep 6 01:52:12 CEST 2008
fxp0: <Intel 82801DB (ICH4) Pro/100 Ethernet> port 0xc800-0xc83f mem
0xe1021000-0xe1021fff irq 20 at device 8.0 on pci1

# ifconfig fxp0
fxp0: flags=9843<UP,BROADCAST,RUNNING,SIMPLEX,LINK0,MULTICAST>
metric 0 mtu 1500
options=8<VLAN_MTU>
ether 00:20:ed:42:87:13
inet 192.168.0.2 netmask 0xffffff00 broadcast 192.168.0.255
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active

BTW overall SAMBA performance still sucks on 7.1-pre as much as on
RELENG_5 ...:( - 7.5 MB/s peak.


7.5MB is 75% effeciency of a 100mbit card. Not amazing, but
not "sucks".

Where do you see faster performance?

Between windows machines on the same hardware or linux server?


It sucks because it is a peak performance. About 5-6 MB/s average. I
tried polling only because I found some suggestions on mailing lists,
that it could improve performance with SAMBA on FreeBSD. As you see at
the top of this thread - not in my case :) I also tried sysctl tunings,
and smb.conf settings, also suggested on maling lists, with no or very
little improvements noticed. Most of suggestions unfortunately end with
"change OS to Linux if you want to use SAMBA". I think I will try to
change NIC to 1Gbit - hope that helps :) Or maybe there's some "FreeBSD
and SAMBA tuning guide" which I didn't found?

Can you please test network I/O using something like netperf or one of
the other network-benchmark tools and not things like NFS or Samba
which rely on disk I/O and other aspects?

--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |

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