I was asked what I meant by "heavy page in/page out", and I'll do my best... We have a monitoring system that believes anything over 10 for pages/second could be a problem, and 20 is really bad. I've gathered this from one of my systems, where: Pgs_in=pages_in (average for day) Pgs_in_max=pags_in_maximum (maximum value for day) Pgs_out=pages_out (average for day) Pgs_out_max=pags_out_maximum (maximum value for day) Some output from one of our Linux systems: sample_date pgs_in pgs_in_max pgs_out pgs_out_max 5/16/2003 0.07 5.68 53.32 159.54 5/17/2003 0.04 3.27 49.89 167.2 5/18/2003 0.09 5.74 50.57 159.61 5/19/2003 0.02 0.04 51.55 160.07 5/20/2003 25.86 657.06 57.06 166.05 5/21/2003 56.21 970.79 66.15 156.4 5/22/2003 10.48 1371.75 58.27 168.07 5/23/2003 0.33 39.9 56.77 148.58 5/24/2003 0.03 0.26 56.2 162.94 5/25/2003 0.02 0.49 56.45 166.74 5/26/2003 0.05 1.13 65.62 173.82 5/27/2003 36.8 754.51 64 203.06 Hence that difficult question of what is the norm? I'm trying to figure out if I have a problem Or this is 'normal' for the system: a dual-CPU 1.4GHz PIII with 4GB of RAM. The OS is on a local Hardware RAID card, but other data/apps are on a SAN attached software RAID0 device. Marco > -----Original Message----- > From: Shaw, Marco > Sent: Thursday, May 29, 2003 11:31 AM > To: 'linux-raid@vger.kernel.org' > Subject: Heavy paging, but no swap being used. > > > RedHat 7.2 with 2.4.18-18.7.xbigmem using RedHat's software > RAID package. > > I've been seeing quite a bit of page in/page out going on, > and have been looking around. > > With the 2.4 kernel, when would one expect to see swap usage? > I'm assuming the 2.4 memory works a bit like Solaris where > one should expect to see physical memory usage relatively > high, and that's a good/normal thing, but I don't see any > swap utilization at all, which concerns me. I may have > misconfigured something... > > How can I pin-point, if possible, whether the paging is > related to the use of software RAID? > > Marco > > # more raidtab > raiddev /dev/md0 > raid-level 0 > nr-raid-disks 2 > persistent-superblock 1 > chunk-size 32 > device /dev/sdc1 > raid-disk 0 > device /dev/sdd1 > raid-disk 1 > > # free > total used free shared buffers > cached > Mem: 3874464 3843256 31208 0 > 381844 3084184 > -/+ buffers/cache: 377228 3497236 > Swap: 2048248 0 2048248 > > # sar -r > Linux 2.4.18-18.7.xbigmem 05/29/2003 > > 12:00:00 AM kbmemfree kbmemused %memused kbmemshrd kbbuffers > kbcached kbswpfree kbswpused %swpused > 12:10:00 AM 33956 3840508 99.12 0 381020 > 3085476 2048248 0 0.00 > > # swapon -s > Filename Type Size Used > Priority > /dev/sda6 partition 2048248 0 -1 > > # more /etc/fstab > LABEL=/ / ext3 > defaults 1 1 > LABEL=/boot /boot ext3 > defaults 1 2 > none /dev/pts devpts > gid=5,mode=620 0 0 > LABEL=/home /home ext3 > defaults 1 2 > none /proc proc > defaults 0 0 > none /dev/shm tmpfs > defaults 0 0 > LABEL=/tmp /tmp ext3 > defaults 1 2 > LABEL=/usr /usr ext3 > defaults 1 2 > LABEL=/var /var ext3 > defaults 1 2 > /dev/md0 /hosting ext3 defaults,usrquota 0 0 > /dev/sda6 swap swap > defaults 0 0 > /dev/cdrom /mnt/cdrom iso9660 > noauto,owner,kudzu,ro 0 > 0 > /dev/fd0 /mnt/floppy auto > noauto,owner,kudzu 0 0 > > > # sar -B > Linux 2.4.18-18.7.xbigmem 05/29/2003 > > 12:00:00 AM pgpgin/s pgpgout/s activepg inadtypg inaclnpg > inatarpg ... > Average: 0.02 55.34 561672 225090 115799 > 180512 > - 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
