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    SubjectRe: [patch for playing] 2.5.65 patch to support > 256 disks
    Date
    On Tuesday 25 March 2003 04:35 am, Jens Axboe wrote:

    > Only testing will tell, so yes you are very welcome to give it a shot.
    > Let me release a known working version first :)

    Jens,

    I found whats using 32MB out of 8192-byte slab.

    size-8192 before:10 after:4012 diff:4002 size:8192 incr:32784384

    It is deadline_init():

    dd->hash = kmalloc(sizeof(struct list_head)*DL_HASH_ENTRIES,GFP_KERNEL);

    It is creating 8K hash table for each queue. Since we have 4000 queues,
    it used 32MB. I wonder why the current code needs 1024 hash buckets,
    when maximum requests are only 256. And also, since you are making
    request allocation dynamic, can you change this too ? Any issues here ?

    Thanks,
    Badari
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