> -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of Raz Ben-Jehuda(caro) > Sent: Monday, November 21, 2005 9:47 AM > To: Guy > Cc: Linux RAID Mailing List > Subject: Re: comparing FreeBSD to linux > > fetching from a disk a random block of 1 MB is aproximately > 20MB/s for a sata disk ( randomly , all over the disk and over a file > system). > god help us if the cpu what that slow. If your CPU load is 90% at 20MB/sec then you have a problem. I get about 56MB per sec on my filesystem which is on a RAID5. The CPU load is less than 50% I have a P3-500MHz 2 CPU system. VERY OLD! I have Linux 2.4.31. I don't know if the newer 2.6 is better or not. Guy > > On 11/21/05, Guy <bugzilla@xxxxxxxxxxxxxxxx> wrote: > > > -----Original Message----- > > > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > > > owner@xxxxxxxxxxxxxxx] On Behalf Of Raz Ben-Jehuda(caro) > > > Sent: Sunday, November 20, 2005 6:50 AM > > > To: Linux RAID Mailing List > > > Subject: comparing FreeBSD to linux > > > > > > I have evaluated which is better in terms cpu load when dealing with > raid. > > > FreeBSD vinum's or linux raid. > > > When i issued a huge amount of io's read to linux raid i got 93% cpu > > > load ( 7% idle), > > > while i having 10% cpu load ( 90% idle ) in the freebsd. > > > > Maybe a silly question... But is it 9.3 times faster under Linux? :) > > That would explain the 9.3 times increase in CPU load. > > > > It is important that you are comparing the CPU load at the same disks > rate, > > or at least factor in the disk rate. > > > > Guy > > > > > > > > I need to switch to linux from freebsd. I am using in linux 2.6.6 > kernel . > > > is problem is a known issue in linux , is it fixed ? > > > > > > -- > > > Raz > > > - > > > To unsubscribe from this list: send the line "unsubscribe linux-raid" > in > > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > -- > Raz > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
