Greetings, I am guessing that this behavior is due to kernel virtual memeory management and as a result porting may be rough. Here are some overall server tuning suggestions that include VM suggestions I hope will help you and not require you to do a lot of porting: http://people.redhat.com/alikins/system_tuning.html Regards, Effrem Norwood > I have been looking for "what changes are made to fix/improve the parallel > access(?) to disks simultanously?". > I noticed as follow; > > Up to Linux2.4.9 it got the same performance for RAID0(2-way > stripe) and a > single disk(JBOD), > about 15 MB/sec with DMA on(hdparm -tT /dev/mdx). > > On Linux 2.4.10 it improves to about 25 MB/sec for RAID0, 15 MB/sec for > single disk. > On Linux 2.4.18 it got the right performance; about 31 MB/sec for RAID0. > > I tried to port the difference on /driver/ide and /drivers/md, but it did > not help. > I think there were changes on other functions to fix the parallel > access(?) > to disks simultanously OR > to improve the RAID0 performance . > > Why am I doing this kind of homework? > > I can not migrate our linux to 2.4.18 so I want to port ONLY the fixes for > this performance > issue. I use Linux2.4.5. > > Please help me if you know how I can work around. > > Thanks in advance, > > Bo - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
