41560 - download causes continual stat calls

Status: VERIFIED FIXED

(Core :: Networking, defect, P3)

Description

[Colin Blake]

I'm seeing this in the 0602 M16 build on OpenVMS (cos that's where my debug 
environment is), but I suspect is happening on all UNIX based builds.

Downloading a large file over a reasonably fast link is very slow. One of the 
reasons I've been able to determine so far is that it appears that each file in 
the disk cache is continually getting stat'd while the download is in progress. 
I have no idea why, but I can see this quite clearly when I put a trace on the 
stat routine.

If I disable the disk cache (set size to zero) the stat's stop and the download 
speeds up.

Comment 1

[sairuh (rarely reading bugmail)]

over to Networking (i don't think this is an xp apps bug, but lemme know if
otherwise).

Comment 2

[Gagan]

hmmm.... this would be a bad thing! 

Comment 3

[Doug Turner (:dougt)]

how are you downloading the file?  

Comment 4

[Colin Blake]

I'm not at my VMS system right now. I'll re-test with my M17 build later this 
morning to see if its still happening, and if so, post exact details.

Comment 5

[Colin Blake]

I am not able to reproduce this with my M17 build, so I guess whatever
the problem was, got fixed.

Feel free to close this bug report. Should I ever see the problem again,
I'll reopen it.

Comment 6

[neeti]

Closing this bug as per reporter's comments

Comment 7

[Tom Everingham]

verified:
Linux rh6.0 2000090708