First async call from WCF client always takes more than 1 second

This is one of the first issues I got to investigate on the WCF/WF performance team. Customers reported that (in .Net 3.5 and earlier), the first asynchronous call from a WCF client was taking over 1 second each time, even with synchronous calls happening before it. The problem can be easily reproduced by modifying the…

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WCF bug with WS-AtomicTransaction expiration value

The team at Microsoft that handles WCF and WF also handles Transactions. This includes System.Transactions, DTC, and the WS-AtomicTransaction implementation available in WCF. Not too long ago I got a chance to diagnose a pretty strange customer issue. The customer reported getting the following exception when using WS-AT under load: The incoming transaction cannot be…

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Win7 sleeps but immediately wakes up

Recently what I thought was a motherboard failure prompted me to replace my motherboard.  I went from an Asus P5N-T Deluxe to a P5N-D.  That’s a slight downgrade but it was a good deal on Newegg.  Anyways, after installing the motherboard I noticed problems with the Windows 7 sleep mode.  As soon as the computer…

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