Re: [PATCH][IPv6] separation xfrm_lookup from ip6_dst_lookup

[Kazunori Miyazawa <kazunori@xxxxxxxxxxxx>]

YOSHIFUJI Hideaki wrote:

> In article <20040801195135.16734846.davem@xxxxxxxxxx> (at Sun, 1 Aug 2004 19:51:35 -0700), 
> "David S. Miller" <davem@xxxxxxxxxx> says:
>
>
> > On Fri, 30 Jul 2004 17:12:05 +0900
> > Kazunori Miyazawa <kazunori@xxxxxxxxxxxx> wrote:
> >
> >
> > > I consider copying flowi(fl_rt) uses too much stack at the moment.
> > > I'll re-send the fixed patch again.
> >
> > I agree, and let's defer this patch until we
> > resolve that.
>
>
> Is the overhead for allocating memory okay?
> Or, do we allcoate some per-cpu memory while ipv6.o initalization phase?
> (check: lock? preemption?)
> Or, will we allocate fl (and fl_rt) per sock{} (ipv6_pinfo{})?
> (ditto.)

My intention is not high art, just using struct in6_addr
instead of struct flowi to store final destination.

> We have similar stack usage in other codes, and 
> I would fix them at the same time.

These might be my changes. I will fix them.

> Another question just for future reference: 
> how many bytes (approx.) do we accept on stack?
>
> Note: sizeof(struct flowi) is 72 bytes (on i386)
>
> --yoshfuji

--Kazunori Miyazawa