SSSE6 / RAID6

SSSE6 / RAID6

[Mathias Burén]

Hi list,

I just compiled 3.4 for my little Atom box. Is there any way I can
confirm if the RAID6 check is using SSSE6 instructions?

$ zcat /proc/config.gz |grep -i -P '(raid|sss)'
CONFIG_RAID_ATTRS=y
CONFIG_MD_RAID0=m
CONFIG_MD_RAID1=m
CONFIG_MD_RAID10=m
CONFIG_MD_RAID456=y
# CONFIG_MULTICORE_RAID456 is not set
CONFIG_DM_RAID=m
CONFIG_ASYNC_RAID6_TEST=m
CONFIG_ASYNC_RAID6_RECOV=y
CONFIG_CRYPTO_SHA1_SSSE3=y
CONFIG_RAID6_PQ=y

 $ cat /proc/cpuinfo  |grep ssse
flags		: fpu vme de tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
constant_tsc arch_perfmon pebs bts nopl aperfmperf pni dtes64 monitor
ds_cpl tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm dts

$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdf1[5] sdh1[8] sdg1[0] sde1[7] sdc1[3] sdd1[4] sdb1[9]
      9751756800 blocks super 1.2 level 6, 64k chunk, algorithm 2
[7/7] [UUUUUUU]
      [>....................]  check =  0.7% (15577860/1950351360)
finish=1918.9min speed=16804K/sec

unused devices: <none>

$ ps aux |grep -i -P '(md|raid)'
root        27  0.0  0.0      0     0 ?        S<   21:52   0:00 [md]
root       342 15.5  0.0      0     0 ?        R    21:52   5:23 [md0_raid6]
root      3937 65.2  0.0      0     0 ?        R    22:13   9:11 [md0_resync]

Thanks,
Mathias

Re: SSSE6 / RAID6

[H. Peter Anvin]

On 05/22/2012 02:27 PM, Mathias Burén wrote:
> Hi list,
> 
> I just compiled 3.4 for my little Atom box. Is there any way I can
> confirm if the RAID6 check is using SSSE6 instructions?
> 

It should be printed in the boot log (/var/log/dmesg or similar.)

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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Re: SSSE6 / RAID6

[Mathias Burén]

On 22 May 2012 23:18, H. Peter Anvin <hpa@zytor.com> wrote:
> On 05/22/2012 02:27 PM, Mathias Burén wrote:
>> Hi list,
>>
>> I just compiled 3.4 for my little Atom box. Is there any way I can
>> confirm if the RAID6 check is using SSSE6 instructions?
>>
>
> It should be printed in the boot log (/var/log/dmesg or similar.)
>
>        -hpa
>
>
> --
> H. Peter Anvin, Intel Open Source Technology Center
> I work for Intel.  I don't speak on their behalf.
>

$ dmesg|grep -i sss
[    1.003566] sha1_ssse3: Using SSSE3 optimized SHA-1 implementation
$ dmesg|grep -i raid
[    0.240120] raid6: int64x1    333 MB/s
[    0.296660] raid6: int64x2    558 MB/s
[    0.353377] raid6: int64x4    573 MB/s
[    0.410019] raid6: int64x8    660 MB/s
[    0.466731] raid6: sse2x1     578 MB/s
[    0.523360] raid6: sse2x2    1024 MB/s
[    0.579973] raid6: sse2x4    1846 MB/s
[    0.579978] raid6: using algorithm sse2x4 (1846 MB/s)
[    1.017503] sata_mv: Highpoint RocketRAID BIOS CORRUPTS DATA on all
attached drives, regardless of if/how they are configured. BEWARE!
[    1.017509] sata_mv: For data safety, do not use sectors 8-9 on
"Legacy" drives, and avoid the final two gigabytes on all RocketRAID
BIOS initialized drives.
[    1.211831] md: raid6 personality registered for level 6
[    1.211835] md: raid5 personality registered for level 5
[    1.211840] md: raid4 personality registered for level 4
[    5.436217] md/raid:md0: device sdf1 operational as raid disk 4
[    5.436223] md/raid:md0: device sdh1 operational as raid disk 5
[    5.436229] md/raid:md0: device sdg1 operational as raid disk 0
[    5.436234] md/raid:md0: device sde1 operational as raid disk 6
[    5.436239] md/raid:md0: device sdc1 operational as raid disk 3
[    5.436244] md/raid:md0: device sdd1 operational as raid disk 2
[    5.436250] md/raid:md0: device sdb1 operational as raid disk 1
[    5.438070] md/raid:md0: allocated 7450kB
[    5.438627] md/raid:md0: raid level 6 active with 7 out of 7
devices, algorithm 2
[    5.438636] RAID conf printout:
[ 1244.523593] md: data-check of RAID array md0

Hm, doesn't look like it's working? (I missed linux-raid)
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Re: SSSE6 / RAID6

[NeilBrown]

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On Tue, 22 May 2012 22:27:42 +0100 Mathias Burén <mathias.buren@gmail.com>
wrote:

> Hi list,
> 
> I just compiled 3.4 for my little Atom box. Is there any way I can
> confirm if the RAID6 check is using SSSE6 instructions?

SSSE6 ? What is that?  Some other name for SSSE3 ??

The SSSE3 RAID6 code was too late for 3.4. It is in -next and should appear
in 3.5-rc1.

NeilBrown

> 
> $ zcat /proc/config.gz |grep -i -P '(raid|sss)'
> CONFIG_RAID_ATTRS=y
> CONFIG_MD_RAID0=m
> CONFIG_MD_RAID1=m
> CONFIG_MD_RAID10=m
> CONFIG_MD_RAID456=y
> # CONFIG_MULTICORE_RAID456 is not set
> CONFIG_DM_RAID=m
> CONFIG_ASYNC_RAID6_TEST=m
> CONFIG_ASYNC_RAID6_RECOV=y
> CONFIG_CRYPTO_SHA1_SSSE3=y
> CONFIG_RAID6_PQ=y
> 
>  $ cat /proc/cpuinfo  |grep ssse
> flags		: fpu vme de tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
> clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts nopl aperfmperf pni dtes64 monitor
> ds_cpl tm2 ssse3 cx16 xtpr pdcm movbe lahf_lm dts
> 
> $ cat /proc/mdstat
> Personalities : [raid6] [raid5] [raid4]
> md0 : active raid6 sdf1[5] sdh1[8] sdg1[0] sde1[7] sdc1[3] sdd1[4] sdb1[9]
>       9751756800 blocks super 1.2 level 6, 64k chunk, algorithm 2
> [7/7] [UUUUUUU]
>       [>....................]  check =  0.7% (15577860/1950351360)
> finish=1918.9min speed=16804K/sec
> 
> unused devices: <none>
> 
> $ ps aux |grep -i -P '(md|raid)'
> root        27  0.0  0.0      0     0 ?        S<   21:52   0:00 [md]
> root       342 15.5  0.0      0     0 ?        R    21:52   5:23 [md0_raid6]
> root      3937 65.2  0.0      0     0 ?        R    22:13   9:11 [md0_resync]
> 
> Thanks,
> Mathias
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Re: SSSE6 / RAID6

[Jim Kukunas]

On Wed, May 23, 2012 at 12:37:32AM +0100, Mathias Burén wrote:
> On 22 May 2012 23:18, H. Peter Anvin <hpa@zytor.com> wrote:
> > On 05/22/2012 02:27 PM, Mathias Burén wrote:
> >> Hi list,
> >>
> >> I just compiled 3.4 for my little Atom box. Is there any way I can
> >> confirm if the RAID6 check is using SSSE6 instructions?

<snip>

The _SSSE3_ RAID6 recovery functions are in Neil's for-next tree. They aren't
in 3.4.

If they were, you'd see something like:

% dmesg | grep ssse3
[    0.167849] raid6: using ssse3x1 recovery algorithm


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-- 
Jim Kukunas
Intel Open Source Technology Center
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Re: SSSE6 / RAID6

[Mathias Burén]

On 23 May 2012 01:26, Jim Kukunas <james.t.kukunas@linux.intel.com> wrote:
> On Wed, May 23, 2012 at 12:37:32AM +0100, Mathias Burén wrote:
>> On 22 May 2012 23:18, H. Peter Anvin <hpa@zytor.com> wrote:
>> > On 05/22/2012 02:27 PM, Mathias Burén wrote:
>> >> Hi list,
>> >>
>> >> I just compiled 3.4 for my little Atom box. Is there any way I can
>> >> confirm if the RAID6 check is using SSSE6 instructions?
>
> <snip>
>
> The _SSSE3_ RAID6 recovery functions are in Neil's for-next tree. They aren't
> in 3.4.
>
> If they were, you'd see something like:
>
> % dmesg | grep ssse3
> [    0.167849] raid6: using ssse3x1 recovery algorithm
>
>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
> --
> Jim Kukunas
> Intel Open Source Technology Center

Aha, that makes sense now. (Neil; I meant SSSE3. Obviously SSSE3 +
RAID6 becomes SSSE6 ;))

Perhaps I can cherry pick these patches and apply them to 3.4.

Mathias
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