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lma	2010-08-19 , 16:45
Posts: 2,802 \| Thanked: 4,491 times \| Joined on Nov 2007	#101

Originally Posted by locusf

I know about the lower priority on the swap, there really is no fix to it, since swapon on Diablo doesn't have the priority switch.

BTW, that's fixable, and I'm thinking of adding it to the community SSU. Here's a ramzez-init modification to handle both cases (as well as getting rid of a (harmless) "sh: : unknown operand" error when disksize isn't set in GConf, and simplifying the insmod logic a bit):

Code:

--- ramzez-init.orig	2010-08-19 17:06:20.000000000 +0100
+++ ramzez-init	2010-08-19 17:34:59.000000000 +0100
@@ -18,14 +18,12 @@
   start)
   	echo "Inserting kernel modules!"
   	DISKSIZE_KB=$(gconftool-2 -g /apps/ramzez/disksize)
+  	DISKSIZE_KB=${DISKSIZE_KB:-$DISKSIZE_DEFAULT}
 	insmod /usr/share/ramzez/xvmalloc.ko
-	if [[ $DISKSIZE_KB != '' ]]; then
-		insmod /usr/share/ramzez/ramzswap.ko disksize_kb=$DISKSIZE_KB
-	else
-		insmod /usr/share/ramzez/ramzswap.ko disksize_kb=$DISKSIZE_DEFAULT
-	fi
+	insmod /usr/share/ramzez/ramzswap.ko disksize_kb=$DISKSIZE_KB
 	sleep 1
-	swapon /dev/ramzswap0	
+	swapon -h 2>&1 | grep -qe "-p" && PRI="-p 1"
+	swapon $PRI /dev/ramzswap0	
 	;;
   stop)
   	echo "Removing kernel modules!"

Also: package ramzez_0.3_diablo_armel.deb seems to be missing /usr/bin/ramzez :-(

Last edited by lma; 2010-08-19 at 16:50.

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maacruz	2010-08-20 , 11:55
Posts: 1,101 \| Thanked: 1,185 times \| Joined on Aug 2008 @ Spain	#102

Originally Posted by lma

BTW, that's fixable, and I'm thinking of adding it to the community SSU. Here's a ramzez-init modification to handle both cases (as well as getting rid of a (harmless) "sh: : unknown operand" error when disksize isn't set in GConf, and simplifying the insmod logic a bit):

Your modification doesn't work because swapon is busybox.
This works, it's already included in the diablo-tweaks package, in the "diabloturbo" thread.

Code:

--- ramzez-init 2009-10-02 12:45:40.000000000 +0200
+++ /etc/init.d/ramzez-init     2010-07-24 15:22:01.000000000 +0200
@@ -19,17 +19,21 @@
        echo "Inserting kernel modules!"
        DISKSIZE_KB=$(gconftool-2 -g /apps/ramzez/disksize)
        insmod /usr/share/ramzez/xvmalloc.ko
-       if [[ $DISKSIZE_KB != '' ]]; then
+       if [[ "$DISKSIZE_KB" != "" ]]; then
                insmod /usr/share/ramzez/ramzswap.ko disksize_kb=$DISKSIZE_KB        else
                insmod /usr/share/ramzez/ramzswap.ko disksize_kb=$DISKSIZE_DEFAULT
        fi
        sleep 1
-       swapon /dev/ramzswap0
+       /sbin/swapon /dev/ramzswap0
+       for i in $(grep -v ramzswap /proc/swaps|grep -v Filename|cut -d " " -f 1); do
+               /sbin/swapoff "$i"
+               /sbin/swapon "$i"
+       done
        ;;
   stop)
        echo "Removing kernel modules!"
-       swapoff /dev/ramzswap0
+       /sbin/swapoff /dev/ramzswap0
        rmmod ramzswap
        rmmod xvmalloc
        ;;

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lma	2010-08-21 , 11:24
Posts: 2,802 \| Thanked: 4,491 times \| Joined on Nov 2007	#103

Originally Posted by maacruz

Your modification doesn't work because swapon is busybox.

Yeah, it assumes a patched busybox for priority handling, otherwise falls back to current behaviour. The patch I linked to isn't quite complete (it assumes some intermediate changes and doesn't update the "trivial" usage message) but I've already got it working here.

This works, it's already included in the diablo-tweaks package, in the "diabloturbo" thread.
Code:
+       for i in $(grep -v ramzswap /proc/swaps|grep -v Filename|cut -d " " -f 1); do
+               /sbin/swapoff "$i"
+               /sbin/swapon "$i"
+       done

This is fine at boot time, but you may not be able to swapoff if the tablet's been running a while :-(

BTW, anyone know what is required kernel-wise to get a more recent compcache on Diablo? Is it worth pursuing?

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lma	2010-08-31 , 13:36
Posts: 2,802 \| Thanked: 4,491 times \| Joined on Nov 2007	#104

Ok, so I've been dogfooding this full-time for a couple of weeks and I can't overstate how much more useable it makes the tablet!

After some experimentation I settled on loading ramzswap.ko with "disksize_kb=131072 memlimit_kb=32768", which allows me to run everything in the attached screenshot without even touching the flash-based swapfile (which I might as well get rid of at this point):

Code:

Nokia-N810-43-7:~# cat /proc/swaps 
Filename				Type		Size	Used	Priority
/dev/ramzswap0                          partition	131068	96608	10
/media/mmc2/.swap                       file		131064	0	-4

Code:

Nokia-N810-43-7:~# free
              total         used         free       shared      buffers
  Mem:       126796       124500         2296            0            8
 Swap:       262132        96608       165524
Total:       388928       221108       167820

Code:

Nokia-N810-43-7:~# cat /proc/ramzswap 
DiskSize:	  131072 kB
NumReads:	   15263
NumWrites:	   25807
FailedReads:	       0
FailedWrites:	       0
InvalidIO:	       0
PagesDiscard:	       0
ZeroPages:	    2980
GoodCompress:	      75 %
NoCompress:	       5 %
PagesStored:	   21465
PagesUsed:	    6976
OrigDataSize:	   85860 kB
ComprDataSize:	   27692 kB
MemUsedTotal:	   27904 kB

I really want to get this (or at least support for it) in the community SSU. So far I've added swapon -p support to busybox and the "swap notify" patch to the kernel, do ping me if there's anything else that would help.

Attached Images

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andyph666	2010-08-31 , 15:25
Posts: 138 \| Thanked: 8 times \| Joined on Dec 2009	#105

cant seem to find ramzez on extras-devel

and i dont think the latest version is on the garage page either. Anyone know where i can find it?

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lma	2010-08-31 , 15:38
Posts: 2,802 \| Thanked: 4,491 times \| Joined on Nov 2007	#106

Based on posts #82 - #86, 0.3 is the latest stable version.

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	tso	2010-08-31 , 17:18
	Posts: 4,783 \| Thanked: 1,253 times \| Joined on Aug 2007 @ norway	#107

So basically you have the whole ram set aside as compressed swap, lma?

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lma	2010-08-31 , 18:02
Posts: 2,802 \| Thanked: 4,491 times \| Joined on Nov 2007	#108

Originally Posted by tso

So basically you have the whole ram set aside as compressed swap, lma?

No, only up to 32MiB (memlimit_kb option, actual usage reported as MemUsedTotal in /proc/ramzswap) which can hold up to 128MiB before compression (disksize_kb, actual size is what is reported by free or /proc/swaps).

In the above snapshot the tradeoff is 27904KiB physical RAM for 96608Kib virtual memory, ie a net gain of around 67MiB without having to use slow flash.

http://code.google.com/p/compcache/wiki/StatsExplained has some more details / discussion.

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	tso	2010-08-31 , 18:35
	Posts: 4,783 \| Thanked: 1,253 times \| Joined on Aug 2007 @ norway	#109

Sure wish the ui tool had more fine-tunable settings.

Ah, now i see. The reported space is what ramzez will try to store in total, by using compression to make it fit within the actually allocated space.

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Last edited by tso; 2010-08-31 at 18:39.