Michael Schuster - Sun Microsystems writes:
> Roch wrote:
> > Michael Schuster writes:
> > > IHAC who is using a very similar test (cp -pr /zpool1/Studio11
> > > /zpool1/Studio11.copy) and is seeing behaviour similar to what we've
> > > seen described here; BUT since he's using a single-CPU box (SunBlade
> > > 1500) and has a single disk in his pool, every time the CPU goes into
> > > "100%-mode", interactive usability is reduced to zero for 1-2
> > > seconds. This is of course undesirable.
> > >
> > > + Do we have any bug IDs or RFEs addressing this?
> > > + Is there any tuning the customer can try (he's willing to do anything
> > with the machine, apart from donating it to me :-)? (we've already tried
> > "echo txg_time/W1 | mdb -kw", with no improvement - on the contrary,
> > machine returned to "usable" state hardly at all).
> > > + has customer (and I) missed a constraint about when/where to deploy
> > zfs?
> > >
> > > thx
> > > Michael
> > >
> > >
> > > This message posted from opensolaris.org
> > > _______________________________________________
> > > zfs-discuss mailing list
> > > zfs-discuss@opensolaris.org
> > > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
> >
> >
> >
> > What is the desired behavior ?
>
> a system that doesn't freeze every few seconds just because someone is busy
> on a zpool.
>
> > The workload (cp with compression) overloads the single
> > CPU. Response time is bound to be affected.
>
> I wasn't aware that compression was involved here. Does raidz imply
> compression? I thought not.
>
> also note: my customer is NOT using compression.
>
> >
> > I am not sure how we could get compression to run at a low
> > priority level, holding up write syscalls.
> >
> > I suggest to Buy a second CPU or turn off compression.
>
> see above - compression is off (I checked :-)
>
> Michael
> --
> Michael Schuster +49 89 46008-2974 / x62974
> visit the online support center: http://www.sun.com/osc/
>
> Recursion, n.: see 'Recursion'
Ok lets get a profile then:
dtrace -n '[EMAIL PROTECTED](20)]=count()} END{trunc(@,20)}'
-r
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