>>>>> "Ingo" == Ingo Molnar <[email protected]> writes:
Ingo> this is the latest version of the mutex subsystem
Ingo> patch-queue. It consists of the following patches:
[snip]
Ingo> the patches are against Linus' latest tree, and were tested on
Ingo> i386, x86_64 and ia64. [the tests were also done in
Ingo> DEBUG_MUTEX_FULL mode, to make sure the code works
Ingo> fine. MUTEX_FULL support is not included in this patchqueue].
Hi,
I have been working with Ingo on porting this to ehe ia64 and run a
bunch of benchmarks using the DEBUG_MUTEX_FULL settings to see how it
behaves on various sized systems (8, 24 and 60 CPUs). In general I am
seeing speedups of roughly a factor 4 on XFS and 2.4 on TMPFS.
Below you will find the results. It's basically the same kernel
version with and without the mutex patch running in DEBUG_MUTEX_FULL
mode without debugging enabled. No other config options were changed.
I won't rule out any pilot errors, but at least it gives an idea about
the change in performance for a specific workload on different sized
boxes.
Cheers,
Jes
All tests on 2.6.15-rc6 with and without the mutex patch, using the
same test app used by Ingo. MUTEX refers to the mutex kernel and the
'no mutex' numbers are for the regular kernel.
I have run the tests on the following systems:
8-way system (1.3GHz ia64)
24-way system (1.3GHz ia64)
60-way system (1.5GHz ia64)
===========================
Tests on XFS MUTEX NO MUTEX
8 CPUs, running 16 parallel test-tasks.
avg ops/sec: 173589 43136
average cost per op: 80.97 usecs 327.03 usecs
average cost per lock: 79.69 usecs 325.20 usecs
average cost per unlock: 1.28 usecs 1.83 usecs
average deviance per op: 65.75 usecs 191.65 usecs
24 CPUs, running 48 parallel test-tasks.
avg ops/sec: 156312 38976
average cost per op: 277.80 usecs 1087.65 usecs
average cost per lock: 276.06 usecs 1085.43 usecs
average cost per unlock: 1.74 usecs 2.22 usecs
average deviance per op: 229.80 usecs 613.78 usecs
60 CPUs, running 120 parallel test-tasks.
avg ops/sec: 188204 41794
average cost per op: 678.86 usecs 2538.53 usecs
average cost per lock: 675.56 usecs 2536.53 usecs
average cost per unlock: 3.29 usecs 1.99 usecs
average deviance per op: 565.65 usecs 1584.21 usecs
60 CPUs, running 540 parallel test-tasks.
avg ops/sec: 181230 44757
average cost per op: 3131.09 usecs 10711.06 usecs
average cost per lock: 3128.05 usecs 10709.21 usecs
average cost per unlock: 3.04 usecs 1.86 usecs
average deviance per op: 2525.36 usecs 6787.48 usecs
Tests on TMPFS MUTEX NO MUTEX
8 CPUs, running 16 parallel test-tasks.
avg ops/sec: 139621 57817
average cost per op: 100.70 usecs 243.71 usecs
average cost per lock: 98.54 usecs 242.28 usecs
average cost per unlock: 2.16 usecs 1.43 usecs
average deviance per op: 76.03 usecs 156.32 usecs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
