RE: kswapd taking 100% CPU - only there's no swap?

["Blackburn, Marvin" <mblackburn glenraven com>]

This is a known problem with RHEL 3.0
we had update 3.  When we upgraded to update 5, the problem went away.
You might have an analogous version in 4 

> -----Original Message-----
> From: nahant-list-bounces redhat com 
> [mailto:nahant-list-bounces redhat com] On Behalf Of Don MacAskill
> Sent: Monday, March 06, 2006 7:28 PM
> To: nahant-list redhat com
> Subject: kswapd taking 100% CPU - only there's no swap?
> 
> 
> We have an 8-way RHEL4 AS system (4 dual-core Opterons) with no swap 
> (because swapping is still broken for DB loads.  It swaps the 
> DB out in 
> preference of disk cache).
> 
> However, 1 of the CPUs is 100% used by kswapd:
> 
> 
> Mem:  32792132k total, 32751292k used,    40840k free,   
> 124256k buffers
> Swap:        0k total,        0k used,        0k free,  
> 3439624k cached
> 
>    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND 
> 
>   5654 mysql     16   0 28.1g  27g 3784 S 31.6 88.1  13239:29 mysqld 
> 
>     95 root      17   0     0    0    0 R 12.1  0.0   7009:01 kswapd3 
> 
>     97 root      15   0     0    0    0 S  0.0  0.0  55:03.42 kswapd1
> 
> 
> We're obviously not starving for RAM (3.4GB in disk cache), 
> and we don't 
> have any swap enabled, so what on earth is it doing and why is it 
> pegging my CPU?
> 
> (It's always kswapd3, btw, not any of the others).
> 
> Does anyone have any ideas?
> 
> Thanks,
> 
> Don
> 
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