RE: [Syllable-kernel] Arno's kernel patches

[Kristian V. <Kri...@an...>]

Jake Hamby wrote:
> Speaking of bad performance, I'm frustrated that there are a 
> couple of threads that chew up a big chunk of CPU time on my system:
> 
> dbterm:  main thread (14%), read thread (7%)
> media_server_flush:  21.7%
> ata_cmd_thread:  up to 17% for each thread
> appserver: keyb_thread: 7.1%
> appserver: input_thread:  2.6%

dbterm is almost certainly because it has to poll the kernel for new
data on the kernel debug port.
ata_cmd_thread may currently have some tight loops in it where it is
impossible to do anything else but poll for a status change.  The ATA
controller only raises an interupt at certain times.  If you're just
waiting for E.g. STATUS_BUSY to go low you must poll the status register
until it happens.  The best you can do is snooze() during the loop.

-- 
Vanders
http://www.syllable.org
http://www.liqwyd.com

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