[lkml]   [2001]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [resent PATCH] Re: very slow parallel read performance
    On Mon, 27 Aug 2001, Alex Bligh - linux-kernel wrote:

    > A nit: I think it's a MRU list you want.

    Absolutely, however ...

    > If you are reading
    > ahead (let's have caps for a page that has been used for reading,
    > as well as read from the disk, and lowercase for read-ahead that
    > has not been used):
    > ABCDefghijklmnopq
    > | |
    > read disk
    > ptr head
    > and you want to reclaim memory, you want to drop (say) 'pq'
    > to get
    > ABCDefghijklmno
    > for two reasons: firstly because 'efg' etc. are most likely
    > to be used NEXT, and secondly because the diskhead is nearer
    > 'pq' when you (inevitably) have to read it again.

    This is NOT MRU, since p and q have not been used yet.
    In this example you really want to drop D and C instead.


    IA64: a worthy successor to i860.

    Send all your spam to (spam digging piggy)

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 12:58    [W:0.023 / U:17.912 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site