Hello Cheng,
On Friday, January 16, 2009 you wrote:
> Ack, could you please make the changelog more descriptive?
> and or add some of your benchmark results?
Of course. We did benchmarking using the Xdd tool like follows:
# xdd -op write -kbytes $kbytes -reqsize $reqsize -dio-passes 2 –verbose -target $target_device
where
$kbytes = data disks * size of disk
$reqsize= data disks * chunk size
$target_device = /dev/md0
This way we did write of full array size, and thus achieved the
maximum performance.
The test cases were RAID-6 built on the top of 14 S-ATA drives
connected to 2 LSI cards (7+7) inserted into the 800 MHz Katmai board
(based on ppc440spe) equipped with 4GB of 800 MHz DRAM .
Here are the results (Psw - write throughput with s/w RAID-6; Phw -
write throughput with the h/w accelerated RAID-6):
PAGE_SIZE=4KB, chunk=64/128/256 KB
Psw = 71/72/74 MBps
Phw = 128/136/139 MBps
PAGE_SIZE=16KB, chunk=256/512/1024 KB
Psw = 81/81/82 MBps
Phw = 205/244/239 MBps
PAGE_SIZE=64KB, chunk=1024/2048/4096 KB
Psw = 84/84/85 MBps
Phw = 258/253/258 MBps
PAGE_SIZE=256KB, chunk=4096/8192/16384 KB
Psw = 81/83/83 MBps
Phw = 288/275/274 MBps
Regards, Yuri
--
Yuri Tikhonov, Senior Software Engineer
Emcraft Systems, www.emcraft.com
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