Date: Wed, 09 Apr 2003 03:17:21 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Aleksandr Melentiev <tzap@pacbell.net> Cc: freebsd-smp@freebsd.org Subject: Re: System freezes with SMP support enabled Message-ID: <3E93F331.E92FC7DF@mindspring.com> References: <001501c2fe72$63c1b040$0300a8c0@kronos>
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Aleksandr Melentiev wrote: > A quick note: I am not subscribed here yet, please reply directly to me. > > Problem: > Apparently SMP support and network do not work well together here. I have > tried both 5.0 and 4.8 releases. Once I recompile the kernels with SMP > support, I start getting constant 'watchdog timeout' on 5.0, network would > halt and system would not respond. Same happens on a 4.8 machine too when I > try to transfer files >1mb in size to an SMP machine, system would freeze, > no error messages though. Nothing in /var/log/messages. Changing network > cards and increasing NMBCLUSTERS doesnt help. No such problems occur > whatsoever without SMP support. > > Motherboard is an Intel N440BX with two Pentium III 500Mhz CPUs. What are both network cards? Are they fxp? There are a couple of possibilities to consider... The first is that if both cards are identical (same vendor, etc.), you might want to use a network card from a different vendor, to make sure it's not the network card driver. Second, it seems to me that there's a possibility for a deadlock if an interrupt comes in on one CPU, and an ithread to handle it is scheduled to run on a different CPU. You may want to try using SCHED_4BSD to see if that changes anything. -- Terry
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