RE: OT: linux kernel process krefilld
- From: Pete Sharman <peter.sharman@xxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 5 Aug 2004 19:18:34 +1000
No, no, no, birch is used only for flogging, not for table making. ;)
I haven't checked into these specific patches, but usually patches to a spe=
cific release are incorporated in the main code line for later releases. I=
'd be surprised if this was any different.
=
Pete
=
"Controlling developers is like herding cats."
Kevin Loney, Oracle DBA Handbook
=
"Oh no, it's not. It's much harder than that!"
Bruce Pihlamae, long-term Oracle DBA
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] =
On Behalf Of Mladen Gogala
Sent: Thursday, 5 August 2004 12:28 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: OT: linux kernel process krefilld
On 08/04/2004 09:56:35 PM, zhu chao wrote:
> Hi, Mladen:
> Using DirectI/O on linux/ext3/AS 2.1 with oracle 9.2.0.4? With
> filesystemio_options? Is ist supported by oracle? Can you give me
> some notes on this topic?
Yes, you can use Direct I/O on AS 2.1 with 9.2.0.4. There were 2 patches
to 9.2.0.3 fixing some problems with direct I/O against ext3, but I believe=
that those were incorporated in 9.2.0.4 or 9.2.0.5 patchset. I'm afraid
that Pete Sharman would be the right person to give the definitive answer. =
=
He always does. After all, he's a member of the birch table, isn't he?
> Thanks very much.
> I also changed the /proc/sys/vm/pagecache to
> [oracle@rac2 oracle]$ cat /proc/sys/vm/pagecache =
> 2 5 10
> This seems to have some effect, as I see less kfilld running. =
> [oracle@rac2 oracle]$ free
> total used free shared buffers cached=
> Mem: 3347708 3072656 275052 0 239156 340784=
------
^
|
This means that you ha=
ve
230M of file system bu=
ffers.
If I assume that oracl=
e is the
only big thing running=
, then
it would mean that, in=
addition
to SGA, you are using =
200M to
cache your data. If yo=
u let
the database run for a=
week, it
would be even more vis=
ible.
> -/+ buffers/cache: 2492716 854992
> Swap: 2048276 220856 1827420
> System seems not short of memory. =
Of course not! Linux box with 3GB RAM can take a lot of punishment before
memory becomes scarce. Double buffering does add significant overhead, thou=
gh
and you really should consider using direct I/O. You can also use it agains=
t OCFS,
which is quite easy to download and link. I'm not quite sure how would tar,=
ls
and other utilities work against it, but I do intend to try it for the Labo=
r Day.
-- =
Mladen Gogala
Oracle DBA
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