Drexx - Some hints -
Check your mobo bios settings to see if youre running your SATA ports in SATA/AHCI mode, and not in ide emulation mode. IDE emulation mode slows down I/O access to a crawl. Also RHEL uses an older kernel than Fedora, and although they backport most drivers, from the main tree, some performance issues remain, so if you want to use RHEL or Centos, roll your own latest kernel version - which makes sure you have all the latest drivers and improvements running. You can also try using 'mpstat' to see just where your performance bottleneck is. Ian On Mon, Jun 2, 2008 at 11:31 AM, Xander Solis <[EMAIL PROTECTED]> wrote: > Hi Drexx, > > Have you saved typical performance outputs (top, free, ps -aux, dmesg) for > analysis? > > Regards, > > On Mon, Jun 2, 2008 at 2:33 AM, thad <[EMAIL PROTECTED]> wrote: >> >> Hi Drexx, >> >> Semi-OT reply but could be related.Are you using LVM? >> >> If you are using LVM, I got same issue on another UNIX OS (AIX) and we >> found out the system is hitting paging logical volume (lv) (read >> pegging to 80-100%) instead of the lvs for Oracle. We re-layout the >> paging into 3 separate lv of equal size and do some virtual memory >> parameter and kernel tunings as per that OS and Oracle recommendation. >> >> Look at your iostat which file system its hitting and you could do >> perf tuning as per RHEL recommendation. NMON would be a great tool to >> use it also works on Linux and we also use filemon(though not sure if >> this available for Linux) parse its output with a perl utility >> filemon.pl and thats when we i identified that our wait state is >> hitting the paging and also confirmed that its not bottlenecking on >> physical volume layer. >> >> >> >> hth, >> >> Thad >> >> On Sun, Jun 1, 2008 at 1:05 PM, Drexx Laggui [personal] >> <[EMAIL PROTECTED]> wrote: >> > 02May2008 (UTC +8) >> > >> > The wait states of Red Hat Enterprise v5.1 x86_64 is unbearable with >> > CryptLUKS (on SATA2 1TB HDD's) --and I haven't even installed VMware >> > 1.0.5 yet! It was so terrible that my machine would hang several >> > times, and eventually crash. 4GB RAM and 2.4GHz quad-core CPU were >> > whipped. Used top and iostat to monitor what I could. Anybody >> > experienced the same thing? >> > >> > Thought I'd migrate from Fedora 8 to RHEL 5. Bad move that cost me a >> > weekend++. I'm back to Fedora 9 now though, so everything has been >> > working like a charm again, even VMware 1.0.6 (with Windows XP SP1, >> > Solaris 10, OpenSolaris 05.2008, SLAX's BackTrack v3, all operational >> > simultaneously). >> > >> > >> > Drexx Laggui -- CISA, CISSP, CFE Associate, ISO27001 LA, CCSI, CSA >> > http://www.laggui.com ( Singapore / Manila / California ) >> > Computer forensics; Penetration testing; QMS & ISMS developers; >> > K-Transfer >> > PGP fingerprint = 6E62 A089 E3EA 1B93 BFB4 8363 FFEC 3976 FF31 8A4E >> > _________________________________________________ >> > Philippine Linux Users' Group (PLUG) Mailing List >> > http://lists.linux.org.ph/mailman/listinfo/plug >> > Searchable Archives: http://archives.free.net.ph >> > >> >> >> >> -- >> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >> sometimes truth is stranger than fiction >> -bad religion- >> http://www.bloglines.com/blog/mailist >> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >> I don't think the computers will take over the world. I have a bucket of >> water. >> _________________________________________________ >> Philippine Linux Users' Group (PLUG) Mailing List >> http://lists.linux.org.ph/mailman/listinfo/plug >> Searchable Archives: http://archives.free.net.ph > > > > -- > -- > Xander Solis > xrsolis.blogspot.com > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > http://lists.linux.org.ph/mailman/listinfo/plug > Searchable Archives: http://archives.free.net.ph > _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List http://lists.linux.org.ph/mailman/listinfo/plug Searchable Archives: http://archives.free.net.ph
