Messages in this thread |  | | From | David Mosberger <> | Date | Tue, 3 Jun 2003 22:34:30 -0700 | Subject | Re: fix TCP roundtrip time update code |
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>>>>> On Tue, 03 Jun 2003 21:40:18 -0700, Nivedita Singhvi <niv@us.ibm.com> said:
Nivedita> David Mosberger wrote: DaveM> So if your old SpecWEB99 lab tended more to trigger timeout DaveM> based retransmits on LAN, and your new test network does not, DaveM> then your new test network will tend to not reproduce the bug DaveM> regardless of whether the bug is present in the kernel or not DaveM> :-)
>> Is this where I get to plug httperf? It triggered the bug >> reliably in less than 10 secs. ;-)
Nivedita> Tarnation!! Ran httperf! Didnt hit it! :(. What were your Nivedita> settings?
I used:
$ httperf --rate 1000 --num-conns 1000000 --verbose --hog --server HOST \ --uri pathto30KBfile
on 3 clients (for a total of 3000 conns/sec). You can't go higher than 1000 conn/sec per client (IP address) because otherwise you run out of port space (due to TIME_WAIT).
This load worked well for a machine with a single GigE card. All network tunables were on the default setting (in particular, the tx queue len was 300, which is were the losses came from).
With this load, I saw bad RTT values in the route cache within a couple of seconds after starting the third httperf generator. It then took a bit longer (on the order of 1-2 minutes) until the first TCPAbortFailed errors started to pop up.
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