On 04/05/2013 07:32 PM, Bill Maidment wrote:
After switching back to the older kernel, I can confirm that the swap
usage has returned to normal, even during the backup time 6am-8am. (See
attached graph)
I'm wondering if this has anything to do with NUMA, which sometimes
prefers to use swap rather than memory that is slightly slower than the
currently used memory.
I am using a single Phenom II 955 processor (quad core) on an ASUS
M4N68T motherboard and SL6.4 upgraded from 6.3
Switching back fixed it for me too. Max swap usage reduced from 100% to
25%, all dumps completed on time. I suppose NUMA could be a factor,
this is a Xeon L5520 system. I haven't seen this large swap usage on my
other older hardware, although I only have the one machine writing
backups to local disk, remote machines send the backup via the network
to this host.
I've filed https://bugzilla.redhat.com/show_bug.cgi?id=949166
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