On 25 March 2008 15:50:46 Marcin Owsiany wrote: > On Tue, Mar 25, 2008 at 03:33:08PM +0300, Vitaliy Gusev wrote: > > Does the original kernel 028.53.3 still have issue with sending ack? > > I didn't try. > > > I see if VE has too small tcprcvbuf (about 30000) then server retransmit > > packets to VE. But i can't reproduce a deadlock state. > > Maybe you need a crappy internet connection to be able to reproduce this > :) > > The way I did that recently was: > 1) saturate the link (medium-quality 4 Mb ADSL) in both directions from > another machine
Traffic from other machine to VE (and vise-versa) or from other machine to VE0? Is it TCP or ICMP traffic? > > 2) give it a couple of minutes until the transfer rates are steady > > 3) start downloading a large file in a VE (I'm in UK and used a > debian-cd mirror in Australia for that) > > 4) give it a couple of minutes until the transfer rate is steady (you > can observe the current window size in tcpdump - just wait until it > stops changing) > > 5) then stop both transfers on the other machine > > 6) after some time (10-20 seconds), the testing VE will notice that > more bandwidth has become available, and you will notice that the > window size will start increasing, to increase the transfer rate > > 7) for me, at the point the window size has reached about 9KB (it takes > just a couple of seconds from the moment the window started > increasing), the deadlock occured > -- Thank, Vitaliy Gusev _______________________________________________ Users mailing list [email protected] https://openvz.org/mailman/listinfo/users
