Re: Reducing inode cache usage on 2.4?

From: Andrea Arcangeli
Date: Tue Dec 21 2004 - 09:42:34 EST

On Tue, Dec 21, 2004 at 01:59:06PM +0000, James Pearson wrote:
> 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?

yes, I was talking about vm_cache_scan_ratio, you can combine the two
sysctl together just fine.

> 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?

The less pages are scanned, the more likely you won't free enough
pagecache, the more likely you'll shrink dcache/icache.

I see why vm_mapped_ratio makes most of the difference though and
probably it's the easier fix for your problem (though increasing
vm_cache_scan_ratio sure won't make things worse).
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