Messages in this thread | | | Date | Wed, 30 Jan 2008 14:47:22 +0100 | From | Patrick McHardy <> | Subject | Re: cups slow on linux-2.6.24 |
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Jeff Chua wrote: > On Jan 29, 2008 6:53 PM, Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> wrote: > >> As the problem can be reproduced so easily, could you capture a full TCP >> session and send the pcap file? Thus it could be analyzed, replayed, etc. >> and found the reason why the patch above slows down the printing. >> By reverting back it we loose TCP reopening support. > > Not an expert here. I use 'tcpdump -i lo' and don't see anything > different between the good and bad. Anyway, attached are the good and > bad log files. > > There's a slight pause of 27 seconds after 502 jobs (both good and bad > runs), then the good one will resume and transmit in burst until > completing all the 1000 times. The bad run will resume and transmit > one-by-one every 3 seconds. > > Please tell me what options to use with tcpdump to dump more useful output.
A binary dump would be more useful:
tcpdump -i lo -w <outfile>
and I guess Jozsef also wants "-s 0" so the full packets are included.
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