Messages in this thread | | | Date | Fri, 27 Feb 1998 12:39:58 +0100 | From | Wolfgang Walter <> | Subject | Re: TCP crashes kernel |
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On Fri, Feb 27, 1998 at 10:55:30AM +0000, Alan Cox wrote: > > For the following I used libc 5.4.44 and linux-pthread 0.7, kernel 2.0.33 > > libc5 has imitation pthreads. Its the clone() case that does it in their > case. It isnt just load as it is with some othe rfolks (the folks still > seeing tcp funnies in 2.0.3x not off clone please do try the patch I sent) >
Hmm, I used linuxthread 0.7 and did not use the pthread coming with libc5. Indeed, the libc5 mit-pthread is not installed at all on my system.
Following the linux-pthread 0.7 documentation, it uses clone() and is for libc5 (in libc6 it is already part of libc itself). Please not that linuxpthread has its own implementations of gethostbyaddr_r, ... (but they seem to be identical to those of libc 5.4.44). As they simply call gethostbyaddr or gethostbyname, respectively, protected by a mutex they probably do not leed to real overlapping network activity. But, correct me if I am wrong, the read() function as kernel system call will cause true overlapping network activity of the threads.
Calling ps I can see the threads as processes as it should be for a cloned() based pthread implementation.
> Alan
I never observed network problems on my machine (P120, ne2000, lib5, 2.0.30 - 2.0.33). Though, we had some of these freezes reported as well as some of the descibed oopses on machines running www-servers. But we never had any problems on machines which do nothing than routing: they all run since 2.0.30 without interruption other than replacing the kernel with a newer version. Another funny thing is that our web-proxy and primary nameserver does not have these problems though under heavy load.
So my experiences are: the machines are very stable if one of the 2 conditions are true:
- only one network card (ne2000 clone), no forwarding - only forwarding, but no tcp-connections of there own
Though, with crash (neither with the canged nor the original one) I can't get any oopses or crashes on any of our machines.
Wolfgang Walter
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