Matt Hartzell wrote:
In my experience I had to disable the USB in the bios.
Do a quick vmstat -i and note how many interrupts are on the uhci
device - with no devices even connected to the usb bus.
Also, what sysctl settings are you using?
If your network supports it, how about using jumbo frames?
Robert Lindgren wrote:
Hi All,
I have a strange little problem on Dell 1800's. If HT,SMP is enabled
in the kernel (5.4p7), performance on the integrated em0 is not
especially good, half the speed of the current 100Mbit connection.
This is true from the server and a little better to the server. On a
pci rl0 card in the same machine performance is even worse. About
15Mbit from the server!
Then I read a lot of people having poor performance from the rl0
cards and a lot of FreeBSD people bashing it for being crap, even in
the source code for the module it's stated that these cards aren't so
good. I guess that is right to some extent but not 15Mbit/sec.
So when I rebuilt the kernel without HT and SMP I get full wirespeed
from the em0 and the rl0 (100Mbit/sec). Is there anything I've been
doing wrong to get hit by this poor performance with the SMP kernel.
I read the disabling USB could improve performance but tried that
with the HT kernel without any luck.
The server has 1 3Ghz cpu, and I would prefer too run a HT enabled
kernel, but not with that kind of performance, so please advice. The
same machines (Dell 1800) run linux with HT enabled without any
network performance degradation.
Best regards
Robert Lindgren
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I see something similar in FreeBSD 6.0-BETA5, no SMP, but with both sk0
and nve0 NICs. This is what my vmstat -i shows up. I do not have
attached any USB device, but there seems to be a lot of interrupt
requests. nve0 seems to 'hang' sometimes. As I can see, nve0 and the
sound device ocm0 (snd_ich) shares an IRQ. Can this be changed anyway?
interrupt total rate
irq1: atkbd0 15130 3
irq4: sio0 6178 1
irq6: fdc0 27 0
irq12: psm0 42158 10
irq14: ata0 13047 3
irq16: fwohci0 1 0
irq17: skc0 4 0
irq22: ehci0+ 11525 2
irq23: pcm0 nve0 27 0
lapic0: timer 8350298 1999
Total 8438395 2020
Oliver
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