Messages in this thread | | | From | Laurence Oberman <> | Subject | Re: Regression in reading /proc/stat in the newer kernels with large SMP and NUMA configurations | Date | Mon, 5 Dec 2011 21:38:18 +0000 (UTC) |
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Laurence Oberman <laurence.oberman <at> hp.com> writes:
> > > Eric Dumazet <eric.dumazet <at> gmail.com> writes: > > Hi Eric, > > I finally managed to get some time to test the patch. I am testing on the > generic kernel.org 2.6.39 tree and will update you as soon as possible. > > Thanks > Laurence > >
Hello, Results are in, patch makes a huge difference:
We are now getting results in the usecs again.
[root@o184i026 lobe]# strace -c ./t Opened, read and closed 8640 times and read total of 69819840 bytes % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 99.86 0.964056 112 8641 read 0.08 0.000786 0 8642 open 0.06 0.000554 0 8642 close 0.00 0.000034 4 8 mmap 0.00 0.000000 0 1 write 0.00 0.000000 0 3 fstat 0.00 0.000000 0 3 mprotect 0.00 0.000000 0 1 munmap 0.00 0.000000 0 1 brk 0.00 0.000000 0 1 ioctl 0.00 0.000000 0 1 1 access 0.00 0.000000 0 1 execve 0.00 0.000000 0 1 arch_prctl ------ ----------- ----------- --------- --------- ---------------- 100.00 0.965430 25946 1 total
What do you need me to do to get your patch accepted.
Thanks Laurence
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