Hi David Here is the second version of this patch, including missing bits spoted by Stephen. This is against net-2.6.22 Thank you [PATCH] 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 CC: Stephen Hemminger CC: John find include/linux/skbuff.h | 26 ++++------------------ include/net/sock.h | 18 +++++++-------- kernel/time.c | 1 net/bridge/netfilter/ebt_ulog.c | 6 +++-- net/compat.c | 15 ++++++++---- net/core/dev.c | 19 +++------------- net/core/sock.c | 16 +++++++------ net/econet/af_econet.c | 2 - net/ipv4/ip_fragment.c | 8 +++--- net/ipv4/netfilter/ip_queue.c | 6 +++-- net/ipv4/netfilter/ipt_ULOG.c | 8 ++++-- net/ipv6/exthdrs.c | 2 - net/ipv6/netfilter/ip6_queue.c | 6 +++-- net/ipv6/netfilter/nf_conntrack_reasm.c | 6 ++--- net/ipv6/reassembly.c | 6 ++--- net/ipx/af_ipx.c | 4 +-- net/netfilter/nfnetlink_log.c | 8 +++--- net/netfilter/nfnetlink_queue.c | 8 +++--- net/packet/af_packet.c | 8 ++++-- net/sunrpc/svcsock.c | 10 ++------ 20 files changed, 85 insertions(+), 98 deletions(-)