Re: tuning FFS for large files Re: A specific example of a disk i/o problem

2009-10-17 Thread Dieter
> > I found a clue! The problem occurs with my big data partitions, > > which are newfs-ed with options intended to improve things. > > > > Reading a large file from the normal ad4s5b partition only delays other > > commands slightly, as expected. Reading a large file from the tuned > > ad4s11 pa

Re: ZFS Re: A specific example of a disk i/o problem

2009-10-06 Thread Thomas Backman
On Oct 6, 2009, at 10:57 AM, O. Hartmann wrote: Thomas Backman wrote: On Oct 5, 2009, at 6:05 PM, Dieter wrote: In message , Thomas Backman writes: I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old 80GB 7200rpm disk. My problem is that I get completely unacceptable la

Re: tuning FFS for large files Re: A specific example of a disk i/o problem

2009-10-06 Thread Bruce Evans
On Mon, 5 Oct 2009, Dieter wrote: I found a clue! The problem occurs with my big data partitions, which are newfs-ed with options intended to improve things. Reading a large file from the normal ad4s5b partition only delays other commands slightly, as expected. Reading a large file from the t

Re: ZFS Re: A specific example of a disk i/o problem

2009-10-06 Thread O. Hartmann
Thomas Backman wrote: On Oct 5, 2009, at 6:05 PM, Dieter wrote: In message , Thomas Backman writes: I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old 80GB 7200rpm disk. My problem is that I get completely unacceptable latency on console IO (both via SSH and serial console

Re: ZFS Re: A specific example of a disk i/o problem

2009-10-05 Thread Thomas Backman
On Oct 5, 2009, at 6:05 PM, Dieter wrote: In message , Thomas Backman writes: I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old 80GB 7200rpm disk. My problem is that I get completely unacceptable latency on console IO (both via SSH and serial console) when the system i

tuning FFS for large files Re: A specific example of a disk i/o problem

2009-10-05 Thread Dieter
I found a clue! The problem occurs with my big data partitions, which are newfs-ed with options intended to improve things. Reading a large file from the normal ad4s5b partition only delays other commands slightly, as expected. Reading a large file from the tuned ad4s11 partition yields the dela

ZFS Re: A specific example of a disk i/o problem

2009-10-05 Thread Dieter
In message , Thomas Backman writes: > I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old > 80GB 7200rpm disk. > > My problem is that I get completely unacceptable latency on console IO > (both via SSH and serial console) when the system is performing disk > IO. The worst

Re: A specific example of a disk i/o problem

2009-10-05 Thread Thomas Backman
(Note: I hope this reply shows up correctly. I subscribed to the mailing list after the fact and had to "forge" the subject line.) Hey everyone, I'm having serious trouble with the same thing, and just found this thread while looking for the correct place to post. Looks like I found it. (I

Re: A specific example of a disk i/o problem

2009-10-02 Thread Richard Mahlerwein
>From: Dieter >Subject: Re: A specific example of a disk i/o problem >To: freebsd-performance@freebsd.org >Date: Friday, October 2, 2009, 1:07 AM > >Updated demo, just to make sure: > ># big_file is larger than main memory, on same disk as man (/usr) >time man de   

Re: A specific example of a disk i/o problem

2009-10-02 Thread Richard Mahlerwein
>From: Dieter >Subject: Re: A specific example of a disk i/o problem >To: freebsd-performance@freebsd.org >Date: Friday, October 2, 2009, 1:07 AM > >Updated demo, just to make sure: > ># big_file is larger than main memory, on same disk as man (/usr) >time man de       

Re: A specific example of a disk i/o problem

2009-10-01 Thread Dieter
> > > >> > My question is why is FreeBSD's disk i/o performance so bad? > > > > > > Here is a specific demo of one disk i/o problem I'm seeing. Should be > > > > easy to reproduce? > > > > > > > > http://lists.freebsd.org/pipermail/freebsd-performance/2008-July/003533.html > > FYI, I thought I'd

Re: A specific example of a disk i/o problem

2009-10-01 Thread Bill Moran
In response to Dieter : > > >> > My question is why is FreeBSD's disk i/o performance so bad? > > > > Here is a specific demo of one disk i/o problem I'm seeing. Should be > > > easy to reproduce? > > > > > > http://lists.freebsd.org/pipermail/freebsd-performance/2008-July/003533.html FYI, I th

Re: A specific example of a disk i/o problem

2009-09-30 Thread Dieter
> >> > My question is why is FreeBSD's disk i/o performance so bad? > > Here is a specific demo of one disk i/o problem I'm seeing. Should be > > easy to reproduce? > > > > http://lists.freebsd.org/pipermail/freebsd-performance/2008-July/003533.html > > > > This was over a year ago, so add 7.1 to

Re: A specific example of a disk i/o problem (was: FreeBSD vs Ubuntu)

2009-09-29 Thread Attilio Rao
2009/9/30 Dieter : >> > My question is why is FreeBSD's disk i/o performance so bad? >> >> As I mentioned... this was discussed actively in slashdot. You will find >> there many good comments on this. > > All I saw in slashdot was a ffs vs ext comment. I don't believe the problems > I'm seeing ar