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 ;-)

Dbench (1 disk, x440 8 real cpus, 16 HT ones)

before: 
Throughput 265.032 MB/sec (NB=331.29 MB/sec  2650.32 MBit/sec)  256 procs
after:
Throughput 381.964 MB/sec (NB=477.454 MB/sec  3819.64 MBit/sec)  256 procs

(I took the second run, first ones are slower, seems to be stable after)

NUMA-Q 16-way (1 disk. 16 cpus)

before:
Throughput 48.5304 MB/sec (NB=60.663 MB/sec  485.304 MBit/sec)  256 procs
after:
Throughput 58.8483 MB/sec (NB=73.5603 MB/sec  588.483 MBit/sec)  256 procs

NUMA-Q has slower disks, old adaptors, and a slow cross-node interconnect.