Using Leo's c test on a 2.4.20 kernel, I am __unable__ to create 3000ms timeouts when doing localhost or interface connections to port 3306 (obviously with a running mysql server). Same results with my test. *However*, if I run those sames tests against other ports I am able to generate hangs. Regardless of kernel, it appears that straight up connections to 3306 behave differently than other ports. If, for example, I generate 1000 connections very quickly to port 22 then run a netstat -na, I will see loads of those connections sitting in TIME_WAIT. If I run the identical test against port 3306 and do the same netstat I will see none of those connections sitting in TIME_WAIT. I'm guessing the mysql does something aggressive with connections to that port and is possibly unrelated to our problem. Still, very interesting. on Wednesday, Apr 02, 2008, Brett Paden, wrote: > > I think this has something to do with net/ipv4/tcp_input.c which contains > > code to initiate and process all the incoming tcp packets. I took a look at > > it, but it is still a very large bunch of code to "review" and I'm far from > > being as experienced in kernel code than original programmers. > > This is exactly where I've been looking, but its extremely tedious to > figure out what's going on given I'm not familiar with the codebase. > > As far as the bug being present in other kernels, we use OS X on > some other servers and do not have the problem. Obviously this isn't a > great test case since its closed source; just intresting to note that > despite their shared BSD lineage something has occured in linux branch. > > Also we have a stock FC4 2.6.17 kernel in production and seem to have > the same problem (although I have not done tcp dumps on these machines > to verify its identical). > -- > To unsubscribe from this list: send the line "unsubscribe linux-net" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
