linux/net/ipx
Eric Dumazet b7aa0bf70c [NET]: convert network timestamps to ktime_t
We currently use a special structure (struct skb_timeval) and plain
'struct timeval' to store packet timestamps in sk_buffs and struct
sock.

This has some drawbacks :
- Fixed resolution of micro second.
- Waste of space on 64bit platforms where sizeof(struct timeval)=16

I suggest using ktime_t that is a nice abstraction of high resolution
time services, currently capable of nanosecond resolution.

As sizeof(ktime_t) is 8 bytes, using ktime_t in 'struct sock' permits
a 8 byte shrink of this structure on 64bit architectures. Some other
structures also benefit from this size reduction (struct ipq in
ipv4/ip_fragment.c, struct frag_queue in ipv6/reassembly.c, ...)

Once this ktime infrastructure adopted, we can more easily provide
nanosecond resolution on top of it. (ioctl SIOCGSTAMPNS and/or
SO_TIMESTAMPNS/SCM_TIMESTAMPNS)

Note : this patch includes a bug correction in
compat_sock_get_timestamp() where a "err = 0;" was missing (so this
syscall returned -ENOENT instead of 0)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
CC: Stephen Hemminger <shemminger@linux-foundation.org>
CC: John find <linux.kernel@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25 22:23:34 -07:00
..
af_ipx.c [NET]: convert network timestamps to ktime_t 2007-04-25 22:23:34 -07:00
ipx_proc.c [PATCH] mark struct file_operations const 7 2007-02-12 09:48:46 -08:00
ipx_route.c [NET] IPX: Fix whitespace errors. 2007-02-10 23:19:44 -08:00
Kconfig [IPX]: Remove outdated information from Kconfig 2007-02-28 09:42:01 -08:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sysctl_net_ipx.c [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00