Re: reiser4 and laptop_mode

[Hans Reiser <reiser@namesys.com>]

David Masover wrote:

>Sinitsyn Valentine wrote:
>  
>
>>Hi all,
>>
>>I'm considering installing Reiser4 on my laptop, but I also want to
>>use laptop_mode (http://www.xs4all.nl/~bsamwel/laptop_mode/index.html)
>>to save battery power. So I'm wondering wether these two products are
>>compatible with each other? I know that Reiser3 and ext3 did require
>>special patches (now included in mainstream kernels) which schedule
>>commits in a way which allows hard drive to spin down. I've looked
>>through Google and this mailing list but didn't find any references to
>>similar patches for Reiser4. Are they needed but nobody wrote them yet
>>or is Reiser4 spindown-friendly just out of the box?
>>    
>>
>
>Reiser4 is spindown-friendly in one way -- until you run out of RAM, it
>won't commit. 
>
This is not true (it would need to be fixed if it was).  You can adjust
how frequent commits are if you don't like our kernel compilation
optimized defaults.

> In fact, if you have enough RAM, you won't ever touch the
>disk -- deleting a file before it's committed means it never touches disk.
>
>It is not as spindown-friendly as laptop_mode, which notices when the
>drive has to spin up anyway (maybe through a read) and flushes all
>writes.  Don't know if they are compatible.
>  
>
We should work to integrate well with it.  Zam, can you look at that? 
Thanks.

>
>  
>