Re: Reducing inode cache usage on 2.4?

[James Pearson <james-p@moving-picture.com>]

Andrea Arcangeli wrote:
> On Tue, Dec 21, 2004 at 11:33:24AM +0000, James Pearson wrote:
> 
>>Setting vm_mapped_ratio to 20 seems to give a 'better' memory usage 
>>using my very contrived test - running a find will result in about 900Mb 
>>of dcache/icache, but then running a cat to /dev/null will shrink the 
>>dcache/icache down to between 100-300Mb - running the find and cat at 
>>the same time results in about the same dcache/icache usage.
>>
>>I'll give this a go on the production NFS server and I'll see if it 
>>improves things.
> 
> 
> Ok great. If 20 isn't enough just set it to 40, just be careful that if
> you set it too high the system may swap a bit too early.

I've changed the value of vm_mapped_ratio to 20 - which has a default 
value of 100 - I guess you're talking about vm_cache_scan_ratio?

I've tried changing just vm_cache_scan_ratio to 20, but it doesn't seem 
to make any difference - I though a higher vm_cache_scan_ratio value 
meant less is scanned?

James Pearson