Re: Weird memory usage, performance problem with 6.1_STABLE

[Lars Heidieker <lars%heidieker.de@localhost>]

On 09/24/2013 04:31 AM, Mark Davies wrote:
> On Fri, 20 Sep 2013, Mark Davies wrote:
>> On Fri, 20 Sep 2013, Lars Heidieker wrote:
>>> Can you see which kernel thread causes high CPU usage by showing
>>> lwps in top? (t toggles those modes)
>>
>> 149 threads: 25 idle, 118 sleeping, 6 on CPU
>> Memory: 15G Act, 15M Wired, 28M Exec, 15G File, 4620K Free
>> Swap: 8192M Total, 8192M Free
>>
>>   PID   LID USERNAME PRI STATE      TIME   WCPU    CPU NAME
>> COMMAND
>>     0    81 root     221 CPU/0     24:19 93.60% 93.60% pgdaemon
>> [system]
>> 13362     1 root     116 tstile/4   6:09 19.58% 19.58% -        
>> ftpd 17398     1 root     221 tstile/2   8:26 18.07% 18.07% -     
>>    ftpd 14648     1 root     116 tstile/1   4:15 16.41% 16.41% -  
>>       ftpd
>>
>>> or even better try:
>>> systat vm 1
>>> and check for page scan rates etc.
>>
>> When it was in the above state  pdscn was reporting around 95000,
>> pdfre was 0.
> 
> 
> So is there something I can tune to get better behaviour out of this?
> Just for comparison I tried the same thing on a 6.1_STABLE/i386 with 
> 4GB (3.3 available)  and with 3 ftp's going it at sat at 2G active and 
> 1G inactive and remained responsive throughout the entire download.
> 
> cheers
> mark
> 

I think the pagescanner can't keep up with the speed, is there any
change in network bandwidth between those machines?
Another idea, the images nearly fit into memory and the ftpd process
trigger the file cache in a way that the page scanner can't find pages
to free...
You wen't from non-smp to smp right?

Lars


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