[Samba] performance regression between 30.14a and 3.0.20

[Jeremy Allison]

On Sun, Apr 23, 2006 at 10:24:37PM -0400, Greg Dickie wrote:
> 
> Perhaps another data point that might ring a bell. While using 3.0.21c 
> and monitoring direct IO vs. buffered IO (on XFS): if you see 40MBs of 
> direct IO you will see another 40 MBs of buffered IO on 21c that you do 
> not see on 14a. According to a colleague he saw this at one point in a 
> previous revision and thought it was a problem of an extraneous sync 
> somewhere.... This might explain why you don't see this with your ram disk.

Ok, I don't understand this message :-). Can you explain exactly
what you mean with "40 MBs of bufferd IO on 21c that you do not
see on 14a" - how are you measuring this and where do you see it ?

Use small words please, I'm very jet-lagged :-).

Jeremy.