Re: e2fs performance as function of block size

[Michael Marxmeier <mike@marxmeier.com>]

Alan Cox wrote:
> I see higher performance with 4K block sizes. I should see higher 
> latency too but have never been able to measure it. Maybe it depends 
> on the file system.
> It certainly depends on the nature of requests

If the files get somewhat bigger (eg. > 1G) having a bigger block
size also greatly reduces the ext2 overhead. Especially fsync() 
used to be really bad on big file but choosing a bigger block
size changed a lot.

If the database used by the original poster is based on 
something like c-isam then (AFAIR) it is in fact using
1k blocks which may explain the better results of 1k block
size. With a 100 MB file size fs management overhead should
not be that visible. 


Michael

-- 
Michael Marxmeier           Marxmeier Software AG
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