jamal wrote:
> That doesnt sound impressive at all. I know it's about .8 of wire rate
> but you should be able to exceed that.
> Robert was generating in the range of 800Kpps with that NIC if i recall
> corectly
I had only tested 1514 byte pkts, so I was getting around 880Mbps,
which is pretty good as far as I know.
I see about 255 kpps when sending 64 byte pkts to myself. Still
dropping about 1 in 4000 packets at this speed. I think most of Robert's
tests didn't involve actually doing something with the received packet
though, and I am inspecting it for latency, sequence number, etc.
I'm even doing a __get_timeofday() call to calculate the latency...need
to find a faster way to do that...
If I only allocate/scan 1 per 100 packets (ie alloc one packet and send it 100
times),
then I get a more respectable 365kpps. Robert's patch should definately help!
> Also if you have SMP, tie each onto a CPU.
That's with the irq_afinity thing in proc, right?
> Additionaly get the skb recycler patch from Robert, it should improve
> things even more.
Do you happen to have a URL for this?
Actually, the various network tweaks are relatively hard to find
(at least to find the most up-to-date coppies). It would be great if
there was a place where they were all concentrated.
>
>
>>Also, I see the hard_start_xmit call failing 5876 times out of 2719493
>>calls (for example). The code that calls the method looks like this:
>>
>
>
> I dont have access to that NIC. But a stoopid question: Have you tried
> increasing the transmit queue via ifconfig? 1000 packets is reasonable
> for gige.
I upped it, but it didn't stop the errors. The NIC is still performing,
so it may not be a real problem...
Thanks for the info,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx> <Ben_Greear AT excite.com>
President of Candela Technologies Inc http://www.candelatech.com
ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
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