On Wed 05-03-08 10:41:34, Sunil Mushran wrote:
> Jan Kara wrote:
>> Actually, it's non-trivial to measure (differently than by profiling).
>> You cannot use standard time functions because they have too low
>> resolution
>> - we are speaking about microseconds here...
>>
> jiffies should have enough resolution.
Not really. On SLES kernels HZ=250 and thus 1 jiffie tick is 4ms. That's
quite a lot - actually, my lockres statistics show that quite a lot of lock
operations get below 4 ms (i.e., time for that acquisition was counted as
0). I guess they are operations that don't require any network
communication...
>> Definitely, they should have 16 or even 32 pages per mount. With 500K
>> lockres, which is not so extreme on bigger FS, 16 pages mean hash chains
>> of
>> average length 61 on x86_64. It is not ideal but I guess it should be
>> sufficient.
>
> Any objections to increasing the default to 32 pages for 1.4?
32 pages is fine with me.
Honza
--
Jan Kara <[EMAIL PROTECTED]>
SUSE Labs, CR
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