Thanks a lot Rob, I have gone through that info, I have some doubts.
1.I am confused where this fixed buffers are residing/created,either in main
storage or in dasd.
2.if they are in dasd then how dasd driver is able to control Linux memory use
below the 2GB line by forcing it to perform I/O out of only a limited set of
I/O buffers.
Wil u plz expalin it clearly...
Thanks
Rajasekhar duddu.
-------------------------------------- Original Message
--------------------------------------
From: [EMAIL PROTECTED]
Date: Oct 18, 2007 13:30:24
Subject: Re: Fixed i/O Buffers......LOZ
On 10/18/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Thanks Rob,
> You are right, but here my job is to test that...So if U can
> provide me with additional info, I wil be grateful to U..
>
http://www.ibm.com/developerworks/linux/linux390/perf/tuning_how_fixed_io_buffers.html
If you are on z/VM 5.1, the most obvious indication is high paging to
expanded storage even though z/VM has plenty of free pages.
When your Linux kernel is old too, you may not have that option. In
that case some relief can be found in taking advantage of MDC. And
obviously in making the virtual machine footprint smaller.
http://www.vm.ibm.com/perf/tips/2gstorag.html
Rob
--
Rob van der Heij
Velocity Software, Inc
http://velocitysoftware.com/
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
-----------------------------------------------------------------
Get your free Email ID at www.zapakmail.com now!
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
