Re: slow network performance

From: Peter Strömberg (wilfried_at_spamcop.net)
Date: 12/27/03 

Date: 27 Dec 2003 12:32:08 GMT

Matt Garman <fake@not-real.bogus> wrote in
news:slrnbuqde4.tjj.fake@sewage.raw-sewage.fake:

> I've been doing some network performance testing using netperf on my
> home LAN. The testing has been between my OpenBSD and Linux boxes,
> which are connected via a 100 Mbps switch.
>
> From the Linux box to the OpenBSD box, I can achieve TCP transfer rates
> of almost 8 MB/s (roughly 64 Mbps). However, from OpenBSD to Linux,
> I'm only getting about 233 KB/s!

obsd -> obsd

mowgli:/tmp $ wget ftp://bagheera/pub/OpenBSD/3.4/i386/base34.tgz
--13:22:04-- ftp://bagheera/pub/OpenBSD/3.4/i386/base34.tgz
           => `base34.tgz'
Logging in as anonymous ... Logged in!
==> SYST ... done. ==> PWD ... done.
==> TYPE I ... done. ==> CWD /pub/OpenBSD/3.4/i386 ... done.
==> PASV ... done. ==> RETR base34.tgz ... done.
Length: 30,993,589 (unauthoritative)
100%[====================================>] 30,993,589 10.55M/s ETA
00:00
13:22:08 (10.55 MB/s) - `base34.tgz' saved [30993589]

fxp0 at pci0 "Intel 82557" rev 0x0c: (Intel EtherExpress) on both machines
thru a netgear switch

> Does anyone have any idea why this is happening? I'm not running any
> type of bandwidth queue or anything (I did a pfctl -F all -d just to
> be sure). Also, I've duplicated these results with three different
> ethernet cards, different cables, and even tried using a crossover
> cable (to avoid the switch).

Bad auto negotiating?

I explicitly specify "media 100baseTX mediaopt full-duplex" in
/etc/hostname.fxp0 

-- 
Peter Strömberg
C2K2 C2K3 ISCCIV02 ISCCIV03

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