Hello Scott,
By the way, do you know which NICs/network controllers support HW
timestamping for all packets (not only the PTP datagrams -- IEEE 1588) ?
Yon
On Mon, May 24, 2010 at 4:26 PM, Mcmillan, Scott A
scott.a.mcmil...@intel.com wrote:
[My apologies if this double posts. The mail
Yon,
I assume you're asking about commodity NICs, not something like Endace.
The NIC I'm most familiar with that supports general hw timestamping is the
Intel 82580 Gigabit Ethernet Controller. It can timestamp all RX packets in
hardware, but only PTP TX packets.
Scott
-Original
Scott,
Is it just the 82580 or others too?
If I look in the source code for OpenSolaris, I see:
igb_82575.h:#defineE1000_SRRCTL_TIMESTAMP 0x4000
igb_82575.h:#defineE1000_RXDADV_STAT_TS 0x1 /* Pkt was
time stamped */
igb_82575.h:#defineE1000_RXDADV_STAT_TSIP
Scott,
How does -j raw generate different output to -j nic?
Looking through your code below, the code which constructs
the data to pass through with the SIOCHWSTAMP ioctl ignores
the timesource member completely (except to check if it is
zero or not and thus turn it on.) This is the change to
On May 24, 2010, at 7:26 AM, Mcmillan, Scott A wrote:
[My apologies if this double posts. The mail server didn't care for the
first submission.]
This patch adds the capability to select the packet timestamp source.
Is there ever any reason *NOT* to use the hardware timestamp if it's
