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- maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
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07-09-2003 03:39 PM
07-09-2003 03:39 PM
When I try and build the 11.22 v1.6 kernel on this rx5670 box, it gives the following message:
root@tybu8520 > pwd
/stand/build
root@tybu8520 > /usr/lbin/sysadm/system_prep -s system
root@tybu8520 > mk_kernel -s system
WARNING: No such device, tunable, or cdio maxswapchunks.
Ignoring the following line.
maxswapchunks 16384
Compiling conf.c...
Loading the kernel...
Generating kernel symbol table...
root@tybu8520 >
Does anybody know if the maxswapchunks kernel parm is not available in this environment? A kmtune before and after doesn't list this parm.
Thanks,
Tim
Solved! Go to Solution.
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07-09-2003 03:55 PM
07-09-2003 03:55 PM
SolutionA quick look at the release notes does indeed mention this parameter has been obsoleted:
http://www.docs.hp.com/hpux/onlinedocs/5187-0701/5187-0701.html
Its under section:
HPUX Features
HPUX Kernel Configuration
Obviously it has had no impact on the kernel build, but a file in /usr/conf/master.d, no doubt core-hpux still has a reference to this. I wouldn't remove this just to be safe.
Regards,
James.
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07-09-2003 04:00 PM
07-09-2003 04:00 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
Sorry, not Kernel Configuration, should be Tunable Kernel Parameters.
Regards,
James.
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07-09-2003 04:05 PM
07-09-2003 04:05 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
http://docs.hp.com/hpux/onlinedocs/TKP-90203/TKP-90203.html
As stated in your post that I had placed a reply, I believe the parameter your after instead of 'maxswapchunks' is 'swchuck'
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07-09-2003 04:13 PM
07-09-2003 04:13 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
Do you still suggest setting the swchunk parm?
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07-09-2003 04:25 PM
07-09-2003 04:25 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
I hope you have a film/TV theme joke going on here with my name! First it was Lethal Weapon with "Murtaugh" then "Murdoch" from the A-Team!! :-)
Anyway, I haven't looked in-depth at this, but it now looks like hpux uses a two stage table to allocate swap chunks. The second appears to be dynamically allocated making maxswapchunks redundant. I wouldn't change swchunks, see the man page for details, availave here:
http://www.docs.hp.com/cgi-bin/onlinedocs.py?mpn=B3921-90010&service=hpux&path=00/22/2211&title=HP-UX%20Reference
Under the memory paging section.
BTW, I just monitor the hpux section where I can see all posts put under it, Ignite included, so as Michael mentioned your post came up twice here. Its good to see you updating the thread with the info though!
Regards,
James.
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07-09-2003 04:46 PM
07-09-2003 04:46 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
Wow, I'm really sorry about butchering your last name - definitely must have had the movies/tv on the brain. I'll have the DBA double-check with Oracle on the swchunk parm before changing it...unless someone here recommends to change it.
Thanks!
Tim
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07-09-2003 04:53 PM
07-09-2003 04:53 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
I actually thought you had planned that and it was really clever! Anyway, don't worry, happens all the time.... ;-D
Anyway, I have a few other threads I need to research when I'm back at work tomorrow....if I find any additional information on this I will be sure to add it to this post.
Take care.
James.
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07-09-2003 07:09 PM
07-09-2003 07:09 PM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
Swapping (actually, paging) is a very bad thing for database engines like Oracle. The very large swap recommendations apply only to installation--unless you have no RAM (less than 2Gb) in which case performance is of no concern to your users (it will be pitiful). If you have lots of RAM, you don't need a lot of swap. Swap space is not some magic enabler to make Oracle run...it is simply a storage area for pages of programs that are inactive. If the programs are all waiting on keyboard input, then this paging is fine. But if the paging rates are in the hundreds (vmstat, look at the po column) then your system will run very slowly. The ony fix is to add a lot more RAM.
Bill Hassell, sysadmin
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07-10-2003 01:22 AM
07-10-2003 01:22 AM
Re: maxswapchunks = swchunk in 11.22 v1.6 for Itanium?
--Tim