RE: [suse-amd64] Instable kswapd / kernel oopses
-----Original Message----- From: Kees Hoekzema [mailto:kees@tweakers.net] Sent: Monday, January 12, 2004 7:58 AM To: suse-amd64@suse.com Subject: [suse-amd64] Instable kswapd / kernel oopses
A kinda nasty piece of work from.. kspwad! What is wrong with kswapd? it crashes our server if we use 6G and slows down our server to a crawl when using 4G (kernel option mem=4g).
I am not seeing any crash problems with our AMD64 SLES servers but we are see very high, sustained kswapd CPU utilization and heavy swapping anytime there is disk I/O of any decent size. It causes the system to choke for a while, sometimes lasting about 30 seconds. I found that turning off the swap partitions (swapoff -a) relives the situation somewhat. (kswapd only hammers one of the CPU's for about 5 to 15 seconds intermittently during disk I/O)
On Mon, 12 Jan 2004 10:30:51 -0900
"Bedard, Joe"
-----Original Message----- From: Kees Hoekzema [mailto:kees@tweakers.net] Sent: Monday, January 12, 2004 7:58 AM To: suse-amd64@suse.com Subject: [suse-amd64] Instable kswapd / kernel oopses
A kinda nasty piece of work from.. kspwad! What is wrong with kswapd? it crashes our server if we use 6G and slows down our server to a crawl when using 4G (kernel option mem=4g).
I am not seeing any crash problems with our AMD64 SLES servers but we are see very high, sustained kswapd CPU utilization and heavy swapping anytime there is disk I/O of any decent size. It causes the system to choke for a while, sometimes lasting about 30 seconds. I found that turning off the swap partitions (swapoff -a) relives the situation somewhat. (kswapd only hammers one of the CPU's for about 5 to 15 seconds intermittently during disk I/O)
We don't see that problem on our systems. What you could do is to boot with profile=2 and send readprofile output (clear the profile log before causing the problem with echo > /proc/profile) This would show where kswapd is spending its time. -Andi
participants (2)
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Andi Kleen
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Bedard, Joe