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BAD_POOL_CALLER? What the …

From time to time, a customer support incident for a bugcheck will make its way over to us on the Performance team.  Those of you that have worked with support engineers on the Performance team already know that we generally don’t work with bugcheck Read More...
Posted Friday, August 29, 2008 6:00 AM by CC Hameed | 0 Comments

The Basics of Page Faults

In our last post, we talked about Pages and Page Tables.  Today, we’re going to take a look at one of the most common problems when dealing with virtual memory – the Page Fault.  A page fault occurs when a program requests an address on a page Read More...
Posted Tuesday, June 10, 2008 6:00 AM by CC Hameed | 2 Comments

Two Minute Drill: Find /3GB without using boot.ini

We've talked a lot about the /3GB switch and its effect on system resources in previous posts.  Today we are going to discuss how to determine whether or not /3GB is enabled on a 32-bit system without looking at the boot.ini file or using MSCONFIG.EXE.  Read More...
Posted Tuesday, May 27, 2008 6:00 AM by CC Hameed | 5 Comments

Troubleshooting Server Hangs – Part Four

Welcome to Part Four of our Server Hang troubleshooting series. Today we are going to discuss PTE depletion and Low Physical Memory conditions and how those two issues can lead to server hangs. In our post on the /3GB switch we mentioned that in general, Read More...
Posted Friday, May 16, 2008 6:00 AM by CC Hameed | 4 Comments

Troubleshooting Server Hangs – Part Three

In our last post on Server Hangs, we discussed using the Debugging Tools to examine a dump file to analyze pool depletion.  Today we are going to look at using our troubleshooting tools to examine a server hang caused by a handle leak.  Issues Read More...
Posted Friday, May 09, 2008 6:00 AM by CC Hameed | 2 Comments

Troubleshooting Server Hangs – Part Two

Several months ago, we wrote a post on Troubleshooting Server Hangs .  At the end of that post, we provided some basic steps to follow with respect to server hangs.  The last step in the list was following the steps in KB Article 244139 to prepare Read More...
Posted Tuesday, May 06, 2008 6:00 AM by CC Hameed | 2 Comments

Using Special Pool to find out who is allocating a Pool Tag

OK, a quick disclaimer right at the start.  The steps we discuss in this post assume that you are very comfortable with kernel debugging, and in particular live debugging.  This is a bit of a niche post, but it is a question that we get every Read More...
Posted Tuesday, April 15, 2008 6:00 AM by CC Hameed | 1 Comments

An Introduction to Pool Tags

We’ve discussed several areas of Memory Management in our blog since we started. Today, we’re going to take a look at Pool Tags and how they can be used to identify the source of Pool Memory leaks. A pool tag is a four-byte character that is associated Read More...
Posted Friday, April 11, 2008 6:00 AM by CC Hameed | 0 Comments

Lock Pages in Memory ... do you really need it?

Back In October, we wrote a post regarding the Event ID 333 Errors and how to troubleshoot them .  At the end of that post, we mentioned the "Lock Pages in Memory" user right.  One of the things we mentioned was that if you have an Read More...
Posted Tuesday, March 25, 2008 6:00 AM by CC Hameed | 6 Comments

WS2008: Memory Management, Dynamic Kernel Addressing, Memory Priorities and I/O Handling

It's the end of the first week - seven days down and only  twenty more to go.  Today we will take a very brief look at some important enhancements to Memory Management, as well as talk about Dynamic Kernel Address Space, Memory Priorities and Read More...
Posted Thursday, February 07, 2008 6:00 AM by CC Hameed | 1 Comments

WS2008: Dynamic Link Library Loader and Address Space Load Randomization

There's only three weeks to go till Launch Day.  Today, we're going to talk about the Dynamic Link Library (DLL) Loader and Address Space Load Randomization.  In Windows Vista and Windows Server 2008, when talking about process and thread creation, Read More...
Posted Wednesday, February 06, 2008 6:00 AM by CC Hameed | 8 Comments

WS2008: Upgrade Paths, Resource Limits & Registry Values

It's February 1, 2008. Only twenty-six more days until Windows Server 2008 is released to the world. With that in mind, we have twenty-six posts lined up between now and February 27 covering areas of Windows Server 2008 that contain both general information Read More...
Posted Friday, February 01, 2008 6:00 AM by CC Hameed | 10 Comments

An Overview of Troubleshooting Memory Issues - Part Two

In our last post, we looked at some common memory issues and how to troubleshoot them.  Today we're going to go over excessive paging and memory bottlenecks. We've talked about issues with the page file in several posts - something to bear in mind Read More...
Posted Tuesday, January 29, 2008 6:11 AM by CC Hameed | 4 Comments

An Overview of Troubleshooting Memory Issues

We've talked quite a bit in the past about various memory management concepts - the use of the /3GB switch , Understanding Pool Resources , the x86 Virtual Address Space and so on.  The most common manifestation of memory issues is a memory shortage Read More...
Posted Friday, January 25, 2008 6:00 AM by CC Hameed | 5 Comments

Understanding Crash Dump Files

At the end of 2007 we talked about Bugchecks and why they happen .  Today we're going to talk about the Crash Dump files themselves - the different types of dumps, how the dumps themselves are generated and why you will need a correctly sized page Read More...
Posted Tuesday, January 08, 2008 6:00 AM by CC Hameed | 6 Comments
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