Messages in this thread | | | Date | Sat, 27 Jan 2007 03:01:43 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [RFC] Limit the size of the pagecache |
| |
On Fri, 26 Jan 2007 02:29:55 -0800 Andrew Morton <akpm@osdl.org> wrote:
> On Wed, 24 Jan 2007 14:15:10 +0900 > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 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. > > Our ia64 server's USB/e100 device uses 32bit-PCI, so sometimes OOM happens on DMA zone. (ia64's ZONE_DMA is 0-4G area.)
But very sorry....I was confused.
I looked the issue above again and found ZONE_NORMAL/x86 was exhausted.
This was interesiting incident,
Constructing DB on 4Gb system has no problem. Constructing DB on 8Gb system always causes OOM.
I asked the users to change DB's parameter. (this happened on RHEL4/linux-2.6.9 series)
> > 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?
Ah, maybe we can use it on RHEL5. We'll test it. thank you.
Thanks, -Kamezawa
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |