Re: [patch] voluntary-preempt-2.6.8.1-P4

Lee Revell
2004-08-19T10:37:10Z

On Thu, 2004-08-19 at 06:29, Lee Revell wrote:

> Yes, this takes care of it. Now the dominant latency is the 142us
> latency from the via-rhine driver, which is fixed by using the driver
> from -mm (specifically it's fixed in bk-netdev.patch).
>

OK, this is a new one:

preemption latency trace v1.0.1
-------------------------------
latency: 104 us, entries: 26 (26)
-----------------
| task: pdflush/33, uid:0 nice:0 policy:0 rt_prio:0
-----------------
=> started at: find_get_pages_tag+0x19/0x90
=> ended at: find_get_pages_tag+0x61/0x90
=======>
0.000ms (+0.000ms): find_get_pages_tag (pagevec_lookup_tag)
0.000ms (+0.000ms): radix_tree_gang_lookup_tag (find_get_pages_tag)
0.000ms (+0.000ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.004ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.008ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.015ms (+0.006ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.019ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.022ms (+0.002ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.026ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.030ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.034ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.038ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.044ms (+0.005ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.048ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.055ms (+0.007ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.057ms (+0.002ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.060ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.066ms (+0.005ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.070ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.074ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.082ms (+0.008ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.083ms (+0.000ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.088ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.092ms (+0.004ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.095ms (+0.003ms): __lookup_tag (radix_tree_gang_lookup_tag)
0.102ms (+0.007ms): sub_preempt_count (find_get_pages_tag)

Lee