Latest FC kernel still have SMP bugs?

WipeOut wipe_out at users.sourceforge.net
Thu Apr 1 16:56:34 UTC 2004


Nigel Wade wrote:

> Mitch Wiedemann wrote:
>
>> Is the FC1 2.4.22-1.2174.nptl kernel still having problems with SMP 
>> and hanging?
>> I'm due to install some MP servers soon and want to avoid problems 
>> (imagine that!).
>>
>> If said kernel is still having trouble, what's the easiest fix?
>>
>> Thanks in advance.
>>
>
> I'm currently investigating SMP here. When I tried stock FC1 and the 
> latest 2.4.22-1.2174.nptl I had severe problems with LDAP. I didn't 
> get any hard lockup, but I would have delays of between 4 and 300 secs 
> in LDAP response times. I have a strong suspicion that the delays are 
> related to FUTEX, but that's hard to prove.
>
> I found that disabling hyperthreading is the answer to my problems. 
> When I disabled it in the BIOS LDAP started behaving itself.
>
> I'm currently stress testing the LDAP server and it's managing ~40,000 
> requests per minute with the peak search times of around 5ms. I read 
> in some other threads that mounting/unmounting NFS and Samba 
> filesystems lead to hard lockups so I'm mounting/listing/unmounting 
> one of each every half hour. The test will be left running for the 
> next 72 hours to see what happens...
>
>
Compile a SMP kernel from vanilla kernel.org source and it works like a 
dream.. Even with HT enabled.. :)

Later..







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