Re: Resets on sil3124 & sil3726 PMP

[Petr Vandrovec <vandrove@vc.cvut.cz>]

Tejun Heo wrote:
> Hello,
> 
> Petr Vandrovec wrote:
>> I have recompiled kernel with all debugging disabled, and it brought me
>> 1.5MBps, so it is still consistently 1MBps slower than on sil. Disabling
>> NCQ seems to improve concurrent access a bit (for which I have no
>> explanation), while slows down single drive scenario:
>>
>> With NCQ:
>>
>> 1TB alone: 81.22, 79.86
>> 1TB+1TB:   56.28+56.70, 53.51+56.11
>>
>> Without NCQ:
>>
>> 1TB alone: 79.78, 80.82
>> 1TB+1TB:   57.99+58.12, 56.50+56.46

3124-2 (norco 4618):

NCQ:

1TB alone:   82.30, 82.43
1TB+1TB:     68.36+68.25

noNCQ:

1TB alone:   82.39, 82.29
1TB+1TB:     70.33+70.32, 69.47+70.01

Unfortunately that enclosure has only two slots used.  I'll try to not 
forget bring two more disks tomorrow to get it fully populated.

>> 3512 sil, no NCQ:
>>
>> 1TB alone: 82.28, 82.18
>> 1TB+1TB:   47.20+47.54    # Here apparently command based switching or
>> 1.5Gbps link between device and PMP becomes bottleneck
> 
> Hmmmm.... Weird.  Is the different still there if you take PMP out of
> the picture?

Will do tomorrow.  I need physical access to the box to do that.
								Petr