Large uploads causes massive CPU utilization

I'm experiencing some problems with uploading large files on my installation of WebWiz Forums 9. I need to be able to upload files larger than 2MB, so I've done the necessary changes in the IIS metabase to accomodate this.

Everything seems to be working just fine for smaller files (up to 2-3 MBs), but when I upload a file larger than that the application worker process (w3wp.exe) starts using massive amounts of CPU time. For a 8MB file, the upload process takes about 3 minutes, and most of this time is spent in kernel mode.

I've tried using debug diag on the process, and I've identified the thread that's causing my problems:


Unfortunately I'm not all that experienced in debugging processes, so this doesn't really tell me all that much.

I'm running the forum software on a 2003 SE Server w/SP2. I've tried using both Persits and Dundas upload components, but the result is exactly the same.

Has anybody experienced similar problems? Any help would be greatly appreciated

First of all, thanks for answering me so quickly

When you say AspUpload, I'm guessing you're not talking about Persits AspUpload... Do you have a link to the component you're talking about?

Hmm, okay.. You see the thing is, I am using the aforementioned AspUpload, but it does not seem to be performing any better than Dundas upload component.

Do I need to tweak/change functions_upload.asp in any way to improve performance? The source code contains the following comment:
   
'** Save the file to the hard drive as saving to memory is often disabled by the web host **

I'm using version 3.0.0.6 of AspUpload, and there is no software RAID in place. The server is, however, running on VmWare ESX Server 3.0.2.

Thanks for all your help, I guess I'll try my luck with the guys at Persits next