[Samba] Red Hat and "use sendfile"

[Steve Snyder]

Recently I've seen several suggestions on this list for the enabling of "use 
sendfile" as a means to improve throughput.  I thought this was peculiar 
since the doc says it is enabled by default.  I guess it isn't.  

On both RHEL4 (Samba v3.0.10) and Fedora Core 4 (Samba v3.0.14) the entry 
for "use sendfile" in the smb.conf says: 

	Default: use sendfile = yes

Hmm.  In fact I just discovered that sendfile is *not* enabled by default in 
these 2 environments.  By doing a verbose output from testparm I see that 
in both these environments "use sendfile" is set to No.  

So what is going on here?  Is the doc just wrong or is Red Hat disabling 
this option in their Samba packages?  

I'm running a Samba v3.0.10 server in RHEL4.  The clients for this server 
are Linux, Win2K and WinXP machines.  Given these circumstances, should I 
enable "use sendfile" to get better throughput?  

Thanks.