Re: Swap partition sizes

[Christopher Slater <olyar@yahoo.com>]

From the swapon manpage:

"In the new style swap area this is precisely what is done.  The
maximum useful size of a swap area now depends on the architecture.  It
is roughly 2GiB on i386, PPC,  m68k, ARM, 1GiB on sparc, 512MiB on
mips, 128GiB on alpha and 3TiB on sparc64.

Presently, Linux allows 8 swap areas.

Also, you should look at the priority setting.  If you set them all at
the same priority they will be used in a round robin fashion (somewhat
like striping).  You'll probably get the best performance by doing
that.

HTH,

Chris

--- Horia Chirculescu <horia@ct2.eltop.ro> wrote:
> He could try to break down swap partition into 4 or more pieces and
> then
> activate the little swap partitions and see what happens.
> 
>                            ____    ____    o           ~ 
>                //     //  / __ \  //   \  // //''''  //\\
>               //_____//  / / / / //___ / // //      //  \\
>              //     //  / /_/ / // \    // //      //____\\ 
>             //     //   \____/ //   \  //  \\.... //      \\
> 
>
------------------------------------------------------------------------
>                           Comtec Net Romania
>            ----------------------------------------------------
>          WEB: www.eltop.ro IRC: irc.eltop.ro NEWS: news.eltop.ro
>            ----------------------------------------------------
>                     Horia Chirculescu root@eltop.ro
>                          Mobil: +40 93 205 086
> 
> On Wed, 24 Apr 2002, James Kelty wrote:
> 
> > Hello! Someone here set up a new machine with 4 Gigs of memory, and
> they 
> > gave the system 8 Gigs of swap. Now, they have a problem.
> Apparently the 
> > OS is only recognizing about two gigs of it.
> > 
> > Here is the fidsk, and meminfo stuff in that order...
> > 
> > Disk /dev/sda: 255 heads, 63 sectors, 2233 cylinders
> > Units = cylinders of 16065 * 512 bytes
> > 
> >     Device Boot    Start       End    Blocks   Id  System
> > /dev/sda1   *         1       383   3076416   83  Linux
> > /dev/sda2           384      1403   8193150   82  Linux swap
> > /dev/sda3          1404      2233   6666975    5  Extended
> > /dev/sda5          1404      1913   4096543+  83  Linux
> > /dev/sda6          1914      2233   2570368+  83  Lin
> > 
> > Mem:  4154732544 4149997568  4734976  5500928 32456704 3929620480
> > Swap: 2147467264        0 2147467264
> > MemTotal:      4057356 kB
> > MemFree:          4624 kB
> > MemShared:        5372 kB
> > Buffers:         31696 kB
> > Cached:        3837520 kB
> > SwapCached:          0 kB
> > Active:          13440 kB
> > Inact_dirty:   3858116 kB
> > Inact_clean:      3032 kB
> > Inact_target:     1244 kB
> > HighTotal:     3211264 kB
> > HighFree:         2036 kB
> > LowTotal:       846092 kB
> > LowFree:          2588 kB
> > SwapTotal:     2097136 kB
> > SwapFree:      2097136 kB
> > NrSwapPages:    524284 pages
> > 
> > 
> > I seem to remember somewhere along the line that Linux has a limit
> on 
> > the swap partition size. Is this ture? I just can't seem to find a 
> > refference to it!
> > 
> > Thanks!
> > 
> > -James
> > -- 
> > James Kelty
> > Sr. Unix Systems Administrator
> > Everbase Systems, LLC
> > jamesk@everbase.net
> > 541.488.0801
> > 
> > -
> > To unsubscribe from this list: send the line "unsubscribe
> linux-admin" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe
> linux-admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 


__________________________________________________
Do You Yahoo!?
Yahoo! Games - play chess, backgammon, pool and more
http://games.yahoo.com/