Re: swap file vs. swap partition

From: Peter Arremann (loony_at_loonybin.org)
Date: 07/30/05

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Sat, 30 Jul 2005 14:26:25 -0400

    On Saturday 30 July 2005 13:06, Mathieu Chouquet-Stringer wrote:
    > menscher@uiuc.edu (Damian Menscher) writes:
    > > A swap partition would be faster (think about it -- no filesystem
    > > overhead).
    >
    > Not true anymore. There is no overhead for a swap file compared to a swap
    > partition:
    >
    > http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/801af09
    >eaf08147c/7bbb9d44ece78faf?lnk=st&q=group:*kernel*+swap+file+partition&rnum=
    >1#7bbb9d44ece78faf

    Was just going to post that link... Yes, there is no performance difference on
    a block by block base between partition and file... but there is still one
    good performance reason to use swap partitions - you can put them in the
    fastest region of the disk. Look at this graph
    http://www.tomshardware.com/storage/20050606/toshiba-05.html#data_transfer_graph
    (just an example, you can usually easily find similar graphs for your drive
    type).
    You see, if you place the swap partition at the end of the disk, you'll get
    like 40% less performance than if it is at the beginning. With a individual
    partition you can control this - with a filesystem (if its larger, i.e. if
    you only make one large / partition) you can't really determine the location
    of your swap file...

    Peter. 

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