What are the settings of your hard disks? Try running hdparm to see and change. Normally using 32bit drivers and enabling DMA brings dramatic change in data transfer. VJ ----- Original Message ----- From: "Kristian Elof Sørensen" <elof@xxxxxxxx> To: <fedora-list@xxxxxxxxxx> Sent: Sunday, September 12, 2004 1:02 PM Subject: dump runs at ~ 4 MB pr. second using Fedora Core 2 instead of the ~ 33 MB pr. second I am used to from previous distributions ! > > Problem: > dump of an entire partition on one disk to a file on an EIDE disk on > another controller progresses at the slooow speed of approx. 4 MB pr. > second > > Using the same kernel on the same machine but with a heavily > upgraded Redhat 7.3 instead of Fedora Core 2, dump progressed at a rate > of 16-33,6 MB pr. second depending on which disk was being dumped. Write > speed to the disk being written to is limited to 33,6 due to long EIDE > cables. > > > Details: > > During dump with Fedora Core 2 the system load is between 2,2 and > 3,2, the three dump threads are consuming 1-3% cpu and less than 2 MB of > memory. > > During dump with Fedora Core 2 free reports that "buffers" is around > 0,75 GB and "cached" around 0,65 GB during dump. Se below for snapshots. > > > > > > System: > Fedora Core 2 > 2.6.8.1 kernel compiled for SMP > Dual Athlon > 1,5 GB RAM > 1,5 GB swap space > > > > free: > > before starting dump > > bash-2.05b# free > total used free shared buffers cached > Mem: 1555436 129140 1426296 0 4460 26456 > -/+ buffers/cache: 98224 1457212 > Swap: 1509352 92368 1416984 > > > while dump is running (the numbers stays pretty much the same for > the entire run of dump) > > bash-2.05b# free > total used free shared buffers cached > Mem: 1555436 1547356 8080 0 735380 629692 > -/+ buffers/cache: 182284 1373152 > Swap: 1509352 120756 1388596 > > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list >
