RE: [PATCH 00/16] raid acceleration and asynchronous offload api for 2.6.22

Justin Piszcz
2007-05-02T15:56:07Z

On Wed, 2 May 2007, Williams, Dan J wrote:

>> From: Nick Piggin [mailto:nickpiggin@yahoo.com.au]
>>> I am pleased to release this latest spin of the raid acceleration
>>> patches for merge consideration. This release aims to address all
>>> pending review items including MD bug fixes and async_tx api changes
>>> from Neil, and concerns on channel management from Chris and others.
>>>
>>> Data integrity tests using home grown scripts and 'iozone -V' are
>>> passing. I am open to suggestions for additional testing criteria.
>>
>> Do you have performance numbers?
>>
> Patch #4 outlines the throughput gains as reported by tiobench. 20-30%
> for sequential writes, and 40-55% for degraded reads.
>
> Here are some recent screen captures of a resync operation with and
> without offload, this is on an iop13xx platform:
>
> mdadm --create /dev/md0 /dev/sd[abc] missing -n 4 -l 5
> mdadm --add /dev/md0 /dev/sdd
>
> ---
> CONFIG_DMA_ENGINE = n
>
> top - 00:01:39 up 1 min, 1 user, load average: 0.77, 0.20, 0.06
> Tasks: 50 total, 1 running, 49 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.3% us, 47.4% sy, 0.0% ni, 49.0% id, 0.0% wa, 0.7% hi,
> 2.6% si
> Mem: 2074836k total, 36276k used, 2038560k free, 0k buffers
> Swap: 0k total, 0k used, 0k free, 16560k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 1307 root 11 -5 0 0 0 S 48.0 0.0 0:14.14 md0_raid5
> 1319 root 15 0 2260 1052 868 R 0.3 0.1 0:00.12 top
>
> iq81340mc:~# cat /proc/mdstat
> Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
> md0 : active raid5 sda[0] sdd[4] sdc[2] sdb[1]
> 468872448 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_]
> [>....................] recovery = 0.7% (1104000/156290816)
> finish=108.1min speed=23919K/sec
>
> ---
> CONFIG_DMA_ENGINE = y && CONFIG_INTEL_IOP_ADMA = y
>
> top - 00:06:21 up 6 min, 1 user, load average: 1.10, 0.68, 0.29
> Tasks: 51 total, 1 running, 50 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.5% us, 7.5% sy, 0.1% ni, 85.8% id, 1.9% wa, 0.5% hi,
> 3.5% si
> Mem: 2074776k total, 40520k used, 2034256k free, 0k buffers
> Swap: 0k total, 0k used, 0k free, 19448k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 1354 root 10 -5 0 0 0 S 11.6 0.0 0:29.32 md0_raid5
> 1491 root 18 0 2256 964 780 R 1.9 0.0 0:00.03 top
>
> iq81340mc:/mnt# cat /proc/mdstat
> Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
> md0 : active raid5 sdd[4] sdc[2] sdb[1] sda[0]
> 468872448 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_]
> [>....................] recovery = 3.5% (5474916/156290816)
> finish=52.2min speed=48061K/sec
>
> Some older iozone data is available here:
> https://sourceforge.net/project/showfiles.php?group_id=115074&package_id
> =203776
>
> Regards,
> Dan
> -
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>

I have not been following this closely, must you have an
CONFIG_INTEL_IOP_ADMA piece of hardware and/or chipset to use this
feature or can regular desktop users take hold of it as well?

Justin.