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

[Lee Revell]

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

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