> > Index: kern/uipc_socket2.c
> > ===================================================================
> > --- kern/uipc_socket2.c	(revision 1673)
> > +++ kern/uipc_socket2.c	(revision 1674)
> > @@ -385,7 +385,7 @@ soreserve(struct socket *so, u_long sndc
> >  	if (so->so_rcv.sb_lowat == 0)
> >  		so->so_rcv.sb_lowat = 1;
> >  	if (so->so_snd.sb_lowat == 0)
> > -		so->so_snd.sb_lowat = MCLBYTES;
> > +		so->so_snd.sb_lowat = MAX(MCLBYTES, sock_loan_thresh);
> 
> If I understand what you're doing, you make sock_loan_thresh variable. If 
> loaning is off, we set it to INT_MAX, which will cause the loan code to 
> never trigger.
> 
> But then wouldn't the above code put the low water at INT_MAX too? That 
> seems like we'd then not have correct high/low water dynamics.

heh, right.  i'll fix.  thanks.

YAMAMOTO Takashi