Messages in this thread | | | Date | Wed, 11 Jul 2001 09:15:22 +0200 | From | Jens Axboe <> | Subject | Re: io_request_lock patch? |
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On Tue, Jul 10 2001, Mike Anderson wrote: > The call to do_aic7xxx_isr appears that you are running the aic7xxx_old.c > code. This driver is using the io_request_lock to protect internal data. > The newer aic driver has its own lock. This is related to previous > comments by Jens and Eric about lower level use of this lock.
Yes
> I would like to know why the request_freelist is going empty? Having
Well, it's a limited resource so it's bound to go empty when under load. In fact, if you have plenty of RAM this is what will end up starting I/O on the queued buffers. With the batch freeing of request slots, this is ok.
> __get_request_wait being called alot would appear to be not optimal.
?? Care to explain your reasoning behind this statement.
-- Jens Axboe
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