Busy-wait delay in qmail 1.03 after upgrading to Linux 2.6
Re: Haakon Riiser
Quoted 2 lines
I think I've been able to create a simple test program that demonstrates the bug I encountered with Qmail.
I've compiled and tested the code you posted, i thought that i would add that renicing the LISTENER processes shows some interesting effects.
at nice 0 the writer spits out about 40 writes under .01 ms, then 3 to 5 writes at 97+ ms, after about 3 minutes its starts to get more random. at nice -1 the writer spits out about 40 writes under .01 ms, then about 40 writes at 97+ ms, kept this cycle for over 10 minutes.
at nice 1 the writer spits out a few hundred writes under .01 ms, and occasionally one at 97+ ms.
same effect if elevator=deadline
This thread caught my intrest because I run qmail on this box.
Peter Maas
Pentium II - 400MHz 128MB PC100
kernel-2.6.1-1.126 from http://people.redhat.com/arjanv/2.6/
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