on 2/13/2008 5:59 AM Alfred von Campe spake the following: > On Feb 12, 2008, at 21:57, William L. Maltby wrote: > >> Check BIOS settings? For memory, CAS etc. the same? Disk hardware the >> same and specified identically? > > Pretty much all the same. They are standard Lenovo desktops, with a 3.4 > GHz Core 2 Duo and 3 GB of memory (the BIOS doesn't let the OS address > more than 3 GB). > >> Presumming that nothing is found there, install system accounting >> packages and run some SAR reports. You may see a clue in them. > > I will try that next. > >> Any "tweaks" on the old system you forgot to apply on the new? Elevator, >> buffer flush interval changes, etc? > > Nope, it's a vanilla kickstart install. I am using the same scripts > (with only slight variations) to build both the 4.x and 5.x systems. I > didn't do anything to "tune" the 4.x systems. That's one of the things > I like about CentOS (and RHEL for that matter): they just work out of > the box. A build (make/gcc) is typically CPU bound. I don't understand > how it can get only 11% of the CPU. That's unheard of. > >> Any other noticeable things on there that may cause it? Presume the >> slowdown is caused by a process that you are not looking at. "Hangs" >> while some other process is waiting or tying up the CPU. Try running >> top. > > There is nothing else running on the systems at the time. I have lots > of terminal windows open on the 4.x system, but I am ssh'ed into the 5.x > system and nobody else is logged in. If anything, the 4.x system should > be slower since there are many more things running on it. >> >> I notice an execve shows on the new one that is not in the old. One says >> "hmmm....". > > The execve is in the other as well, just a few lines further down (i.e., > it didn't make the cut when I did the "head strace.log"). > >> What does swapon -s show? > > CentOS 4.6: > Filename Type Size > Used Priority > /dev/mapper/VolGroup00-LogVol00 partition 4095992 > 210592 -1 > > CentOS 5.1: > Filename Type Size > Used Priority > /dev/mapper/VolGroup00-LogVol00 partition 3047416 > 120 -1 > >> Is the system "seeing" the same amount of memory "available" or have >> BIOS settings in one reduced available? > > CentOS 4.6: > MemTotal: 3113612 kB > MemFree: 24868 kB > Buffers: 23164 kB > Cached: 2428508 kB > SwapCached: 136108 kB > Active: 1685808 kB > Inactive: 1257004 kB > HighTotal: 2226560 kB > HighFree: 1088 kB > LowTotal: 887052 kB > > CentOS 5.1: > MemTotal: 3114452 kB > MemFree: 2722528 kB > Buffers: 84592 kB > Cached: 174804 kB > SwapCached: 0 kB > Active: 187084 kB > Inactive: 137220 kB > HighTotal: 2226560 kB > HighFree: 1972860 kB > LowTotal: 887892 kB > >> If all new equipment on the new one, open her up and reseat all >> connections, PCI cards and mem sticks. Make sure all power connectors >> are well seated to MB and drives. > > I will double check that. I may also try to install 4.6 on the HW that > is currently running 5.1 and see if there is a problem. With my > kickstart scripts I can have the system up and running in less than 30 > minutes. That is probably the best next step to rule out any HW > issues. I'll do that as soon as I get into the office. > >> Front side bus and memory speeds set the same in BIOS? > > Should be. > >> That's all I can think of that may be even remotely related ATM > > Thanks for all the excellent suggestions, Bill. > > Alfred I didn't see it but did you do a 'uname-a" on both systems to see if one is running a PAE kernel? -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 250 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20080213/44f9c6f3/attachment-0005.sig>