Re: [PATCH] concurrent block allocation for ext3

[Martin J. Bligh]

SDET on my machine (16x NUMA-Q) has fallen in love with your patch, 
and has decided to elope with it to a small desert island. This is 
despite it's one disk hung off node 0, and the IO througput of a 
slightly damp piece of cotton thread. Apologies for the loss of your 
patch as it gets whisked away ;-)

M.

PS. Oh, I had this bit, per akpm-instructions: For best results, add ____cacheline_aligned_in_smp to struct ext2_bg_info

PPS. I'll try to run some more focused tests with aim7 over the weekend.
As if we needed it ...

-------------------------

DISCLAIMER: SPEC(tm) and the benchmark name SDET(tm) are registered
trademarks of the Standard Performance Evaluation Corporation. This 
benchmarking was performed for research purposes only, and the run results
are non-compliant and not-comparable with any published results.

Results are shown as percentages of the first set displayed

SDET 1  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         1.8%
         2.5.64-mjb3-ext2       102.0%         1.1%

SDET 2  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         3.7%
         2.5.64-mjb3-ext2       106.1%         3.1%

SDET 4  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         1.5%
         2.5.64-mjb3-ext2       101.1%         2.1%

SDET 8  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         0.2%
         2.5.64-mjb3-ext2       113.3%         0.7%

SDET 16  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         1.1%
         2.5.64-mjb3-ext2       167.1%         0.8%

SDET 32  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         0.9%
         2.5.64-mjb3-ext2       170.7%         0.1%

SDET 64  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         0.7%
         2.5.64-mjb3-ext2       157.2%         0.5%

SDET 128  (see disclaimer)
                           Throughput    Std. Dev
          2.5.64-bk3-mjb3       100.0%         0.3%
         2.5.64-mjb3-ext2       151.3%         0.8%