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From: John Fremlin <vii@users.sourceforge.net>
To: Jason McMullan <jmcmullan@linuxcare.com>
Cc: <linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>
Subject: Re: VM Requirement Document - v0.0
Date: 28 Jun 2001 23:47:53 +0100	[thread overview]
Message-ID: <m24rt0gr1i.fsf@boreas.yi.org.> (raw)
In-Reply-To: <20010626155838.A23098@jmcmullan.resilience.com>
In-Reply-To: <20010626155838.A23098@jmcmullan.resilience.com> (Jason McMullan's message of "Tue, 26 Jun 2001 15:58:38 -0400")


[...]

> 	immediate: RAM, on-chip cache, etc. 
> 	fast:	   Flash reads, ROMs, etc.
> 	medium:    Hard drives, CD-ROMs, 100Mb ethernet, etc.
> 	slow:	   Flash writes, floppy disks,  CD-WR burners
> 	packeted:  Reads/write should be in as large a packet as possible
> 
> Embedded Case

[...]

> Desktop Case

I'm not sure there's any point in separating the cases like this.  The
complex part of the VM is the caching part => to be a good cache you
must take into account the speed of accesses to the cached medium,
including warm up times for sleepy drives etc.

It would be really cool if the VM could do that, so e.g. in the ideal
world you could connect up a slow harddrive and have its contents
cached as swap on your fast harddrive(!) (not a new idea btw and
already implemented elsewhere). I.e. from the point of view of the VM a
computer is just a group of data storage units and it's allowed to use
up certain parts of each one to do stuff

[...]

-- 

	http://ape.n3.net

WARNING: multiple messages have this Message-ID (diff)
From: John Fremlin <vii@users.sourceforge.net>
To: Jason McMullan <jmcmullan@linuxcare.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: VM Requirement Document - v0.0
Date: 28 Jun 2001 23:47:53 +0100	[thread overview]
Message-ID: <m24rt0gr1i.fsf@boreas.yi.org.> (raw)
In-Reply-To: <20010626155838.A23098@jmcmullan.resilience.com> (Jason McMullan's message of "Tue, 26 Jun 2001 15:58:38 -0400")

[...]

> 	immediate: RAM, on-chip cache, etc. 
> 	fast:	   Flash reads, ROMs, etc.
> 	medium:    Hard drives, CD-ROMs, 100Mb ethernet, etc.
> 	slow:	   Flash writes, floppy disks,  CD-WR burners
> 	packeted:  Reads/write should be in as large a packet as possible
> 
> Embedded Case

[...]

> Desktop Case

I'm not sure there's any point in separating the cases like this.  The
complex part of the VM is the caching part => to be a good cache you
must take into account the speed of accesses to the cached medium,
including warm up times for sleepy drives etc.

It would be really cool if the VM could do that, so e.g. in the ideal
world you could connect up a slow harddrive and have its contents
cached as swap on your fast harddrive(!) (not a new idea btw and
already implemented elsewhere). I.e. from the point of view of the VM a
computer is just a group of data storage units and it's allowed to use
up certain parts of each one to do stuff

[...]

-- 

	http://ape.n3.net
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
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  parent reply	other threads:[~2001-06-28 22:49 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-26 19:58 VM Requirement Document - v0.0 Jason McMullan
2001-06-26 21:21 ` Rik van Riel
2001-06-26 21:29   ` Jason McMullan
2001-06-26 21:33   ` John Stoffel
2001-06-26 21:42     ` Rik van Riel
2001-06-26 22:21       ` Stefan Hoffmeister
2001-06-26 22:48         ` Jeffrey W. Baker
2001-06-27  0:18           ` Mike Castle
2001-06-28 13:07         ` John Fremlin
2001-06-27 13:36       ` Marco Colombo
2001-06-27  3:55     ` Daniel Phillips
2001-06-27 14:09     ` Pozsar Balazs
2001-06-28 22:47 ` John Fremlin [this message]
2001-06-28 22:47   ` John Fremlin
2001-06-30 15:37 ` Pavel Machek
2001-07-10 10:34 ` David Woodhouse
     [not found] <fa.oqkojpv.3hosb7@ifi.uio.no>
     [not found] ` <fa.jpsks3v.1o2gag4@ifi.uio.no>
2001-06-27  0:43   ` Dan Maas
2001-06-27  0:45     ` Mike Castle
2001-06-27 10:50     ` Xavier Bestel
  -- strict thread matches above, loose matches on Subject: below --
2001-06-27  8:53 Martin Knoblauch
2001-06-27 18:13 ` Rik van Riel
2001-06-28  6:59   ` Martin Knoblauch
2001-06-28 11:27 ` Helge Hafting
2001-06-28 11:54   ` Martin Knoblauch
2001-06-28 12:02   ` Tobias Ringstrom
2001-06-28 12:31     ` Xavier Bestel
2001-06-28 13:05       ` Tobias Ringstrom
2001-06-28 12:20 mike_phillips
2001-06-28 12:30 ` Alan Cox
2001-06-28 13:33   ` Tobias Ringstrom
2001-06-28 13:37     ` Alan Cox
2001-06-28 14:04       ` Tobias Ringstrom
2001-06-28 14:14         ` Alan Cox
2001-06-28 14:52       ` Daniel Phillips
2001-06-28 14:39 ` Daniel Phillips
2001-06-28 15:21   ` Jonathan Morton
2001-06-28 16:02     ` Daniel Phillips
2001-06-28 18:01   ` Marco Colombo
2001-07-02 18:42     ` Rik van Riel
2001-07-03 10:33       ` Marco Colombo
2001-07-03 15:04         ` Daniel Phillips
2001-07-03 18:24           ` Daniel Phillips
2001-07-04  8:12           ` Ari Heitner
2001-07-04  9:41           ` Marco Colombo
2001-07-04 15:03             ` Daniel Phillips
2001-07-03 18:29       ` Daniel Phillips
2001-07-04  8:32         ` Marco Colombo
2001-07-04 14:44           ` Daniel Phillips
2001-07-04 16:08 mike_phillips
     [not found] <fa.jprli0v.qlofoc@ifi.uio.no>
     [not found] ` <fa.e66agbv.hn0u1v@ifi.uio.no>
2001-07-05  1:49   ` Dan Maas
2001-07-05 13:02     ` Daniel Phillips
2001-07-05 14:00       ` Xavier Bestel
2001-07-05 14:51         ` Daniel Phillips
2001-07-05 15:04         ` Daniel Phillips
2001-07-05 15:00           ` Xavier Bestel
2001-07-05 15:12             ` Daniel Phillips
2001-07-05 15:12           ` Alan Shutko
2001-07-06 19:09           ` Rik van Riel
2001-07-06 21:57             ` Daniel Phillips
     [not found]   ` <002501c104f4/mnt/sendme701a8c0@morph>
2001-07-09 12:17     ` Pavel Machek
2001-07-12 23:46       ` Daniel Phillips
2001-07-13 21:07         ` Pavel Machek
2001-07-05 15:09 mike_phillips

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