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SubjectRe: io_request_lock patch?
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.


> 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

> __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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