Re: [BENCHMARK] 2.5.60-cfq with contest

[Jens Axboe]

On Tue, Feb 11 2003, Jens Axboe wrote:
> > Write based loads hurt. No breakages, but needs tuning. 
> 
> That's not even as bad as I had feared. I'll try to do some tuning with
> contest locally.

Here are my results, for 2.5.60 vanilla, 2.5.60 + cfq with default
quantum of 16 (what you tested, too), and 2.5.60 + cfq without quantum
setting. The latter should be the fairest, only moves one request from
the pending queues.

no_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     31      177.4   0       0.0     1.00
2.5.60-cfq0       2     31      174.2   0       0.0     1.00
2.5.60-cfq16      2     31      177.4   0       0.0     1.00
cacherun:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     29      182.8   0       0.0     0.94
2.5.60-cfq0       2     28      192.9   0       0.0     0.90
2.5.60-cfq16      2     29      182.8   0       0.0     0.94
process_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     38      142.1   12      47.4    1.23
2.5.60-cfq0       2     41      129.3   16      61.0    1.32
2.5.60-cfq16      2     37      145.9   12      43.2    1.19
ctar_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     38      147.4   0       0.0     1.23
2.5.60-cfq0       2     36      155.6   0       0.0     1.16
2.5.60-cfq16      2     36      155.6   0       0.0     1.16
xtar_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     40      140.0   0       2.5     1.29
2.5.60-cfq0       2     37      148.6   0       2.7     1.19
2.5.60-cfq16      2     40      137.5   0       2.5     1.29
io_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     93      61.3    2       14.0    3.00
2.5.60-cfq0       4     103     54.4    2       12.6    3.32
2.5.60-cfq16      2     264     21.6    12      19.9    8.52
read_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     40      140.0   0       5.0     1.29
2.5.60-cfq0       2     39      143.6   0       5.1     1.26
2.5.60-cfq16      2     40      140.0   0       5.0     1.29
list_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     35      157.1   0       8.6     1.13
2.5.60-cfq0       2     35      160.0   0       8.6     1.13
2.5.60-cfq16      2     35      160.0   0       14.3    1.13
mem_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     50      116.0   75      10.0    1.61
2.5.60-cfq0       2     57      101.8   78      8.8     1.84
2.5.60-cfq16      2     60      96.7    80      8.2     1.94
dbench_load:
Kernel       [runs]     Time    CPU%    Loads   LCPU%   Ratio
2.5.60            2     36      155.6   12693   27.8    1.16
2.5.60-cfq0       1     35      157.1   12013   28.6    1.13
2.5.60-cfq16      2     37      151.4   14356   32.4    1.19

-- 
Jens Axboe