Choppy performance.

[Ruslan Kovtun]

 17 2008 Daniel Andersson Wrote:
> >Turning off prefetch improved my workload (I play video from it for
> >
> > >ex, no more skiped frames)
> >
> > Okay, I'll try it. Guess I'll have to reboot..=D
> >
> > >raidz isn't mirroring, that would be the mirror option.
> > >You loose one disk's storage for parity when you use raidz, and since
> > >you only added 2 disks to that raidz you lose 50% of your storage
> > >space. It has the appearance of mirroring but in fact it's not.
> > >Your choice of a raidz was wrong for what you really needed and you
> > >have to destroy the raidz pool to be able to change it.
>
> I suspected it was something like that, for the lack of a better
> word I used mirroring. Thanks for clearing it up for me!
>
> >Instead of using:
> > >zpool create yourpoolname raidz disk1 disk2
> > >use:
> > >zpool create yourpoolname disk1 disk2
>
> Okay, I'll try that. I guess I was a little too eager to try out ZFS
> and didn't read up properly. =P
>
> >Ruslan Wrote:
> > I have the same problem - rtorrent to hang temporarily during high load.
> >Today I installed additional 2 GB RAM and now I have 4Gb. With this
> >configuration hanging is more less but still exist (during ZFS upload data
>
> to
>
> >pool and swap use>0).
> >Seems, If swap not used (=0) then no any hanging.
> >So, More RAM - more beter.
>
> Okay. My server box's mobo only has two slots for RAM.=(
> A curious thing happened today with rtorrent. I had set
> rtorrent so that it couldn't use more than 3072MB of ram.
> (2048MB RAM + swap). rtorrent said it was using 2800MB
> but when I checked with top the swap wasn't in use at all?

How do you calculate totall memory use in top? Real memory use is present 
in "RES" column but not in "SIZE" column. 

################################
PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
 1215           engy        1  99    0  2085M   139M zfs:(&  49:32
 19.53%      rtorrent
################################

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