[bf1942] Serious cpu use drop with beta 7

[Patrick Gavin]

Hyperthreading on the P4 Xeon makes each processor appear as two 
processors to the kernel, so you will need to enable SMP to enable it.

Reinder P. Gerritsen wrote:

>Enabling SMP in the kernel can be done @ "make menuconfig" when you
>recompile the kernel yourself, is meant for dual cpu systems or higher.
>However, I have only linux experience on dual Athlon MP1200 and dual
>tualatin core PIII. I have no idea what the specifics are when it comes
>to hyperthreading. I think that it should work though, because SMP
>effectively enables multithreaded applications to make use of both
>processingunits in Hyperthreading.
>
>Compiling information van be found on
>http://www.tldp.net/HOWTO/Kernel-HOWTO/index.html
>
>However, the readme of OB6 and 7 reads:
>
>Known issues:
>- SMP kernels can cause the server to use a lot more CPU than what it
>  it really should be using; the only known workaround is to use
>  a non-SMP kernel. People are also reporting success with the
>  development kernels (the 2.5.x series), which is only recommended
>  for the daring.
>
>So unless you need it on your system (ie you have a dual CPU system, and
>need to make use of both units) I'd advise against using this option
>until the problem is fixed.
>
>-----Original Message-----
>From: Battlefield at digitalnines.com [mailto:battlefield at digitalnines.com]
>
>Sent: Friday, June 27, 2003 16:38
>To: bf1942 at icculus.org
>Subject: Re: [bf1942] Serious cpu use drop with beta 7
>
>
>"SMP enabled "
>Does that work with hyperthreading?
>How do you enable it?
>
>BhAaD
>----- Original Message ----- 
>From: "Reinder P. Gerritsen" <reinder at strikerz.net>
>To: <bf1942 at icculus.org>
>Sent: Friday, June 27, 2003 9:56 AM
>Subject: RE: [bf1942] Serious cpu use drop with beta 7
>
>
>  
>
>>I had a "hang" last night. While the 3 bf1942_lnxded processes were 
>>still there in the ps output, there was no reaction from the server. 
>>Also screen didn't attach anymore.
>>
>>Unfortunately, I currently have no information about when it exactly 
>>stopped responding, or under which circumstances, but there were 
>>complaints about lag yesterday evening.
>>
>>Slackware 8.1
>>2.4.18 SMP enabled (DIY Compiled to keep out anything that isn't 
>>needed) OB7-Static.
>>
>>Grtz.
>>Fox.
>>
>>-----Original Message-----
>>From: Casey Zacek [mailto:bfb-bf at bogleg.org]
>>Sent: Friday, June 27, 2003 13:58
>>To: bf1942 at icculus.org
>>Subject: Re: [bf1942] Serious cpu use drop with beta 7
>>
>>
>>
>>Yeah, I actually had OB7 crash on me last night around 18:30 central. 
>>The server was full at the time.  I didn't post anything, though, 
>>because I got dumb and deleted the core dump, so I have no backtrace.
>>
>>It had been running for about 32 hours.
>>
>>This time, it was a Segmetation Fault, though, not the Illegal 
>>Instruction I got with OB4.
>>
>>Martin Steiger wrote (at Thu, Jun 26, 2003 at 10:27:34PM +0200):
>>    
>>
>>>Hi
>>>It seems the CPU-load-problem has "disappeared" (at least for my
>>>server it did)...
>>>
>>>Server: P4 2.0 Ghz, 512 MB SDRAM, running DC 0.38 (don't know 
>>>anything
>>>      
>>>
>>>about kernel or anything... :)
>>>
>>>However: did anyone notice crashin the server after some amount of
>>>time? Happened yesterday with 20 players playing Stalingrad and
>>>      
>>>
>today 
>  
>
>>>again with no players on Gazala. If not, can anyone tell me (as easy
>>>      
>>>
>
>  
>
>>>as possible) to get some useful information about this crash? Plz,
>>>      
>>>
>I'm
>  
>
>>>"sort of" a Noob at linux, so only use easy words... :)
>>>
>>>Thanx!
>>>
>>>-----Urspr?ngliche Nachricht-----
>>>Von: Paul Richards [mailto:noxis at clara.net]
>>>Gesendet: Donnerstag, 26. Juni 2003 21:17
>>>An: bf1942 at icculus.org
>>>Betreff: Re: [bf1942] Serious cpu use drop with beta 7
>>>
>>>
>>>Where did those funky stat graphs come from?
>>>
>>>
>>>----- Original Message -----
>>>From: "James Gurney" <james at globalmegacorp.org>
>>>To: <bf1942 at icculus.org>
>>>Sent: Thursday, June 26, 2003 7:23 AM
>>>Subject: [bf1942] Serious cpu use drop with beta 7
>>>
>>>
>>>      
>>>
>>>>I've been running beta7 since this morning, and the cpu use has
>>>>*drmatically* dropped when the server is full.
>>>>
>>>>You can see this neatly illustrated in here:
>>>>
>>>>http://fez.cracksmokingmonkeys.net/woo/
>>>>
>>>>The top graph is cpu use over the last 32 hours or so. The lower
>>>>graph is the number of players on the server in the same time 
>>>>period. As you can see, the number of players has been consistant 
>>>>before and after switching the server to beta 7. However, average 
>>>>cpu use has dropped considerably, which is great news.
>>>>
>>>>Thanks Andreas!
>>>>
>>>>James
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>      
>>>
>>-- 
>>-- Casey Zacek (Zippo)                  Beer for Breakfast servers
>>   66.111.111.66:27015 (CS multi-map)     <http://bfb.bogleg.org/>
>>   66.111.111.66:27016 (CS inferno/dust2/aztec/militia) Dallas, TX
>>   66.111.111.66:14567 (BF1942)
>>
>>    
>>