Re: RFC on io-stalls patch

[Marcelo Tosatti]

On Mon, 14 Jul 2003, Jens Axboe wrote:

> Some initial results with the attached patch, I'll try and do some more
> fine grained tomorrow. Base kernel was 2.4.22-pre5 (obviously), drive
> tested is a SCSI drive (on aic7xxx, tcq fixed at 4), fs is ext3. I would
> have done ide testing actually, but the drive in that machine appears to
> have gone dead. I'll pop in a new one tomorrow and test on that too.
>
> no_load:
> Kernel            [runs]        Time    CPU%    Loads   LCPU%   Ratio
> 2.4.22-pre5            2        134     196.3   0.0     0.0     1.00
> 2.4.22-pre5-axboe      3        133     196.2   0.0     0.0     1.00
> ctar_load:
> Kernel            [runs]        Time    CPU%    Loads   LCPU%   Ratio
> 2.4.22-pre5            3        235     114.0   25.0    22.1    1.75
> 2.4.22-pre5-axboe      3        194     138.1   19.7    20.6    1.46
> xtar_load:
> Kernel            [runs]        Time    CPU%    Loads   LCPU%   Ratio
> 2.4.22-pre5            3        309     86.4    15.0    14.9    2.31
> 2.4.22-pre5-axboe      3        249     107.2   11.3    14.1    1.87
> io_load:
> Kernel            [runs]        Time    CPU%    Loads   LCPU%   Ratio
> 2.4.22-pre5            3        637     42.5    120.2   18.5    4.75
> 2.4.22-pre5-axboe      3        540     50.0    103.0   18.1    4.06
> io_other:
> Kernel            [runs]        Time    CPU%    Loads   LCPU%   Ratio
> 2.4.22-pre5            3        576     47.2    107.7   19.8    4.30
> 2.4.22-pre5-axboe      3        452     59.7    85.3    19.5    3.40
> read_load:
> Kernel            [runs]        Time    CPU%    Loads   LCPU%   Ratio
> 2.4.22-pre5            3        150     181.3   8.1     9.3     1.12
> 2.4.22-pre5-axboe      3        152     178.9   8.2     9.9     1.14

Awesome. I'll add it in -pre6.

Thanks a lot Jens.