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    SubjectRe: ll_rw_blk.c fails to merge requests. Help!
    > I have two comments about this patch.  (the reqfree-batching-3)
    >
    > First. Couldn't it end up indefinitely starving a writer?
    >
    > Assume the free_list is empty [...]

    I think that can also happen in 2.2.x and plain 2.4-test7.

    I have a question. There is a rq queue for eache device, right ? Well, why
    when I flood the queue of the removable also write accesses to my harddisc
    get starved ? A simple "cp 100KBfile foobar" from HD to HD can stay
    blocked in D state for 10's seconds even with a lot of free mem.
    Perhaps because the queue spinlock is global ? m, no I can't see a code
    path that holds the lock for a lot of time...
    The HD and the removable are attached to two different SCSI controllers (2
    Adaptec 2930U).

    Bye.
    -
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