Choppy performance.

[Ruslan Kovtun]

Hey!

 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.  



В сообщении от Среда 16 апреля 2008 Daniel Andersson написал(a):
> Hey!
>
> ZFS seems to be working for me. It hasn't crashed/hung
> for me yet and I've been running it for about two weeks now.
> The only issue I have so far is that it seems very choppy. FTP
> transfers vary from 6 - 70MB/s. If I run rtorrent under high load
> and use top to monitor it:
>
> last pid: 74309;  load averages:  0.53,  0.39,  0.35    up 5+05:52:41
> 00:03:25
> 41 processes:  2 running, 39 sleeping
> CPU states: 10.1% user,  0.0% nice, 30.0% system,  1.1% interrupt, 58.8%
> idle
> Mem: 1369M Active, 127M Inact, 374M Wired, 97M Cache, 213M Buf, 4692K Free
> Swap: 1024M Total, 27M Used, 997M Free, 2% Inuse
>
> PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
> 1215           engy        1  99    0  2085M   139M zfs:(&  49:32
> 19.53%      rtorrent
> ....
>
> rtorrent seems to hang temporarily only when  the STATE is zfs:(&.
> Any ideas why or how I can fix it? Does rtorrent steal the RAM ZFS needs?
> I've tuned it according to the tuning guide:
>
> #sysctl.conf
> kern.maxvnodes=400000
> #loader.conf
> vm.kmem_size_max="1073741824"
> vm.kmem_size="1073741824"
>
> I just noticed that I didn't set vfs.zfs.prefetch_disable=1. I don't get
> the deadlocks but could
> the prefetch_disable fix my problem?
>
>
> I'm currently running a raidz pool with only two disks. Is there some way
> to turn
> off the mirroring? I don't really care if the stuff on the disks get
> corrupted/broken.
> I would however like to get 1TB instead of 500MB. =P
>
> Thanks for porting ZFS!
>
> Cheers,
> Daniel
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Ковтун Руслан mailto <yalur at mail.ru>