[linux-lvm] read is blocking if reading snapshots with 16k blocks on mp systems

[Patrick Caulfield]

On Thu, Jan 10, 2002 at 07:58:37PM +0100, Martin Petermann wrote:
> Hi all,
> 
> I had some performance problems, than I wrote a small program to see where
> it was hanging:
> 
> -my configuration:
> 
> I'm using a SuSE 7.1 and SuSE 7.2 mp system (two processors).
> I've created a snapshot in the following way:

 
> The maximum time read was hanging was 40 seconds. I detected similar
> problems reading 3*4096 bytes.

Can you tell us more about your system - I can't get this to over 3 seconds even
on a dog slow IDE system with next-to no memory. 

patrick