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Subject: Re: [gentoo-user]  Re: Howto share Linux swap partition with Windows XP
Date: Sat, 24 Jan 2009 21:39:23 +0000
References: <glbjqi$ptv$1@ger.gmane.org> <200901241044.09521.peter@humphrey.ukfsn.org> <glfcg4$ajd$1@ger.gmane.org> <200901241552.28443.peter@humphrey.ukfsn.org> <glfiok$t30$1@ger.gmane.org>
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On 24 Jan 2009, at 17:22, Grant Edwards wrote:
> I still can't believe that Windows does it's swapping using a
> normal filesystem -- and by default it's the same filesystem
> used for system and application files.  It seems like the
> filesystem code would end up being a serious bottleneck.

    > 3. Does creating the swapfile on a journaled filesystem (e.g.
    > ext3 or reiser) incur a significant performance hit?

    None at all. The kernel generates a map of swap offset -> disk
    blocks at swapon time and from then on uses that map to perform
    swap I/O directly against the underlying disk queue, bypassing all
    caching, metadata and filesystem code.

    http://lkml.org/lkml/2005/7/7/326

Stroller.