Re: NT -> Win2K causes performance degradation..

[Paul Drake]

Mark,

 

My guess is, that the new OS re-instated the file system caching.

By default, 41% (yes, it should have been 42%) of physical memory will be allocated to filesystem caching, as W2K thinks it a fileserver (and domain controller, web server, print server, etc) until you tell it otherwise.

 

This is much improved in w2k3 server - where you tell it what you want it to be.

 

A good sysadmin would have set the OS to "optimize throughput for network applications" which would have turned off the filesystem caching. Ok, its only one radio button to select, so an MSCE could set it also.

 

Surprisingly enough, in W2K Server - changing this setting does not require a reboot, although I don't know if the changes take effect until after a system restart. That's not the sort of thing that I usually test, as NT4 had me trained to reboot afterwards.

 

the other thing may be, that the boot.ini no longer supports the /3GB or /PAE switches as Jared mentioned - but that should not cause the symptoms you are reporting.

 

hth.

 

Paul

Mark Leith <[EMAIL PROTECTED]> wrote:

Hi All,

We've been asked a question from one of our clients that I'm a little
stumped on.

They run an OLTP database (Oracle 8.1.7), and have recently upgraded their
NT machine to Windows 2000, they were running with 2gb of memory, and
upgraded that to 4gb in the process. As they increased physical memory, they
also increased their SGA size & db_block_buffers.

Since they've upgraded they have noticed a significant decrease in
performance (the way it was described to me was "it was 7 out of 10, and is
now 3 out of 10"..).

Has anybody else done a system upgrade of this nature that has caused less
than desirable effects? Any pointers as to what to look at? We've requested
some stats (top wait stats etc.) and I'll feed these back as and when I get
them - but I thought I'd throw this out to you guys in the vague hope thatsomeone has experienced some relatively similar experiences.

Cheers!

Mark

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