On Wed, 24 Jan 2007 14:15:10 +0900
KAMEZAWA Hiroyuki <[email protected]> wrote:
> - One for stability
> When a customer constructs their detabase(Oracle), the system often goes to oom.
> This is because that the system cannot allocate DMA_ZOME memory for 32bit device.
> (USB or e100)
> Not allowing to use almost all pages as page cache (for temporal use) will be some help.
> (Note: construction DB on ext3....so all writes are serialized and the system couldn't
> free page cache.)
I'm surprised that any reasonable driver has a dependency on ZONE_DMA. Are
you sure? Send full oom-killer output, please.
> - One for tuing.
> Sometimes our cutomer requests us to limit size of page-cache.
>
> Many cutomers's memory usage reaches 99.x%. (this is very common situation.)
> If almost all memories are used by page-cache, and we can think we can free it.
> But the customer cannot estimate what amount of page-cache can be freed (without
> perfromance regression).
>
> When a cutomer wants to add a new application, he tunes the system.
> But memory usage is always 99%.
> page-cache limitation is useful when the customer tunes his system and find
> sets of data and page-cache.
> (Of course, we can use some other complicated resource management system for this.)
> This will allow the users to decide that they need extra memory or not.
>
> And...some customers want to keep memory Free as much as possible.
> 99% memory usage makes insecure them ;)
Tell them to do "echo 3 > /proc/sys/vm/drop_caches", then wait three minutes?
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