Bug#600031: updating kernel causes slow write speed to raid

2010-10-15 Thread Dave Clarke
On 15 October 2010 02:33, Ben Hutchings wrote: > On Thu, 2010-10-14 at 15:16 +0100, Dave Clarke wrote: >> Ben >> That has solved it. Now getting around 27MB/s write on ext4 and 97MB/s >> read with the experimental kernel. I'm happy with these speeds on this >> hardware. It is still a little slower

Bug#600031: updating kernel causes slow write speed to raid

2010-10-14 Thread Ben Hutchings
On Thu, 2010-10-14 at 15:16 +0100, Dave Clarke wrote: > Ben > That has solved it. Now getting around 27MB/s write on ext4 and 97MB/s > read with the experimental kernel. I'm happy with these speeds on this > hardware. It is still a little slower then with windows but I can live > with that. Good,

Bug#600031: updating kernel causes slow write speed to raid

2010-10-14 Thread Dave Clarke
Ben That has solved it. Now getting around 27MB/s write on ext4 and 97MB/s read with the experimental kernel. I'm happy with these speeds on this hardware. It is still a little slower then with windows but I can live with that. May be able to get better by tuning read-ahead buffer and vm.dirty_rat

Bug#600031: updating kernel causes slow write speed to raid

2010-10-13 Thread Ben Hutchings
On Thu, 2010-10-14 at 00:31 +0100, Dave Clarke wrote: > Running bonnie++ locally. Have formatted / as ext3 and /home/ as ext4. > using raid5. Also to note that when booted with windows server 2003 > using Everest disk benchmark it does an average of 34MB/s (peaking to > 50MB/s). > > Attached are b

Bug#600031: updating kernel causes slow write speed to raid

2010-10-13 Thread Dave Clarke
Running bonnie++ locally. Have formatted / as ext3 and /home/ as ext4. using raid5. Also to note that when booted with windows server 2003 using Everest disk benchmark it does an average of 34MB/s (peaking to 50MB/s). Attached are bonnie++ output for the two kernel versions and ext3 and ext4 (ext4

Bug#600031: updating kernel causes slow write speed to raid

2010-10-12 Thread Ben Hutchings
On Tue, 2010-10-12 at 23:07 +0100, Dave Clarke wrote: > Package: linux-image > Version: 2.6.32-5-686 > > After dist-upgrade from Lenny to Squeeze write speed is halved. Shown > with bonnie++. Before upgrade write speed was 21MB/s, after upgrade > 10MB/s. Let's see the output from bonnie++. Also

Bug#600031: updating kernel causes slow write speed to raid

2010-10-12 Thread Dave Clarke
Package: linux-image Version: 2.6.32-5-686 After dist-upgrade from Lenny to Squeeze write speed is halved. Shown with bonnie++. Before upgrade write speed was 21MB/s, after upgrade 10MB/s. Hardware: Dell Powervault 745n with hardware raid Adaptec 2610SA. Celeron(R) CPU 2.40GHz, 512MiB RAM. Confi