[Performance] Samba 3 vs. Samba 4 performance in NetBench

[Jeremy Allison]

On Tue, Jun 21, 2005 at 04:26:48PM +1000, Andrew Tridgell wrote:
> Jeremy,
> 
>  > That's exactly what it's doing.
> 
> yep, I remember you telling me about the word problem. It's an
> interesting one!
> 
> Marc, can you get me an equivalent sniff of netbench using exactly the
> same client but with a w2k3 server? Keep everthing else as similar as
> you can to the two sniffs you've sent me already. I'd like to find out
> if w2k3 is getting this 1 byte write problem, and if not then what it
> is that is telling the client to avoid them.
> 
> In the sniffs you sent me the client is not making any FS_INFO file
> system attribute queries, so it can't be using that to determine if
> the server has sparse file support or not, and its not doing any file
> query calls or ioctls that control sparseness. That leaves me stumped
> as to how w2k3 could be avoiding this (unless its not avoiding it!).

Well the default on NTFS is non-sparse, and you have to explicitly
set a file sparse to select that, so I'm guessing that netbench
is just doing a good simulation of what Word actually does - ie. it
always does the one-byte allocation write.

Jeremy.