Re: [lc-devel] hello

[Bob A. <cu...@pb...>]

i patched 2.4.21rc2-ac2 , there were few trivial rejects, i didn't fixed 
only the ones in swapfile.c (i assume they're important when something 
is wrong with swap)

i disabled "support for page cache compression" , compiled and booted.
it works!

i'll install this kernel on my firewall too, which is only non-smp machine 
left :>

btw. what are problems with making patch (or at least parts of it) SMP-able?
i use openmosix patch making cluster out of few single-cpu machines, and on
oM group (ope...@li...) one of programmers got 
information about your patch recently, but never readed it (some other user 
posted question wheter this and few others could be merged into oM)

i think at least swap compression support could be merged in.

btw. performance - my laptop is a bit more responsive, stats show about 50% 
compression ratio and lot of pages compressed. 
one of good things is that when it spins up disk (it is usually off) to swap
something in/out it doesn't 'freeze' system for time disk isn't available.
i think it's because of grouping of swapout requests and compressing them 
before swapping out (so instead of swap out some of memory is just compressed
waiting for disk to spin up, and then -when disk is available-swapped out)

about swapfile - thanks for hint, 
swapon swapfile.img works. 
ofcourse i tested 2.4.21-rc2-ac2-cc with swap via /dev/loop0 before i 
switched to more robust swap method :)



On Saturday 17 May 2003 19:09, Rodrigo Souza de Castro wrote:
> On Sat, May 17, 2003 at 06:16:59PM +0200, curious wrote:
> > i compiled patch from you, and it bug() in filemap.c:66
> > in process loop0 .
> > then in concluded it may be associated with mmaped loop0
> > so i disabled "support for page cache compression"
> > without this ccache works fine and stable :D
>
> That is great, although you probably will want support for page cache
> compression when we fix this problem :-)
>
> > i had swapping via loop0 , and it was on filesys, quite rare case,
> > but happens.
>
> If I understood correctly from your previous email, you have a file
> from a FAT partition that you mount in Linux using loop device, right?
> I will try to set it up here to try to reproduce the problem if I
> notice I don't have clue of what may be wrong. However, let me ask you
> something. If you are using a swap file, and mounting it using loop,
> why don't you set up Linux to use the swap file directly, since it has
> support for it? Is there any issue related to a be a file on a FAT
> partition?
>
> > are you having clue what might be b0rked ?
>
> I still don't a clue of what is going on.
>
> > in meantime i'll apply patch to 21rc2-ac1 and test it with page
> > cache compression disabled.
>
> Great, tell me if you have problems running comp cache with this
> version.
>
> Regards,

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