Hi Guys,
Rather than starting a new thread I thought I'd continue this thread.
I've been running Build 54 on a Thumper since Mid January and wanted
to ask a question about the zfs_arc_max setting. We set it to "
0x100000000 #4GB", however its creeping over that till our Kernel
memory usage is nearly 7GB (::memstat inserted below).
This is a database server so I was curious if the DNLC would have this
affect over time, as it does quite quickly when dealing with small
files? Would it be worth upgrade to Build 59?
Thank you in advance!
Best Regards,
Jason
Page Summary Pages MB %Tot
------------ ---------------- ---------------- ----
Kernel 1750044 6836 42%
Anon 1211203 4731 29%
Exec and libs 7648 29 0%
Page cache 220434 861 5%
Free (cachelist) 318625 1244 8%
Free (freelist) 659607 2576 16%
Total 4167561 16279
Physical 4078747 15932
On 3/23/07, Roch - PAE <[EMAIL PROTECTED]> wrote:
With latest Nevada setting zfs_arc_max in /etc/system is
sufficient. Playing with mdb on a live system is more
tricky and is what caused the problem here.
-r
[EMAIL PROTECTED] writes:
> Jim Mauro wrote:
>
> > All righty...I set c_max to 512MB, c to 512MB, and p to 256MB...
> >
> > > arc::print -tad
> > {
> > ...
> > ffffffffc02e29e8 uint64_t size = 0t299008
> > ffffffffc02e29f0 uint64_t p = 0t16588228608
> > ffffffffc02e29f8 uint64_t c = 0t33176457216
> > ffffffffc02e2a00 uint64_t c_min = 0t1070318720
> > ffffffffc02e2a08 uint64_t c_max = 0t33176457216
> > ...
> > }
> > > ffffffffc02e2a08 /Z 0x20000000
> > arc+0x48: 0x7b9789000 = 0x20000000
> > > ffffffffc02e29f8 /Z 0x20000000
> > arc+0x38: 0x7b9789000 = 0x20000000
> > > ffffffffc02e29f0 /Z 0x10000000
> > arc+0x30: 0x3dcbc4800 = 0x10000000
> > > arc::print -tad
> > {
> > ...
> > ffffffffc02e29e8 uint64_t size = 0t299008
> > ffffffffc02e29f0 uint64_t p = 0t268435456 <------ p
> > is 256MB
> > ffffffffc02e29f8 uint64_t c = 0t536870912 <------ c
> > is 512MB
> > ffffffffc02e2a00 uint64_t c_min = 0t1070318720
> > ffffffffc02e2a08 uint64_t c_max = 0t536870912 <------- c_max is
> > 512MB
> > ...
> > }
> >
> > After a few runs of the workload ...
> >
> > > arc::print -d size
> > size = 0t536788992
> > >
> >
> >
> > Ah - looks like we're out of the woods. The ARC remains clamped at 512MB.
>
>
> Is there a way to set these fields using /etc/system?
> Or does this require a new or modified init script to
> run and do the above with each boot?
>
> Darren
>
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