There are many factors that make the timestamps an approximation. In addition
to the ones already mentioned, the timestamps is typically taken several kernel
layers higher than the driver.
You can avoid these approximations on Linux by using tcpdump -j / -J with a NIC
that is capable of hard
Hi,
What are the plans for the next libpcap and tcpdump releases? 1.1.1 and 4.1.1
were released April 5, 2010.
Thanks,
Scott
-
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Guy,
Thank you for significantly improving and merging this capability into the
official repository. I fully agree with your changes. I was thinking that way
myself, but was hesitant to propose changes of that degree as my first
contribution.
As I was testing your changes, I noticed some ver
n May 24, 2010, at 7:26 AM, Mcmillan, Scott A wrote:
> This patch adds the capability to select the packet timestamp source. It
> also adds support for the PACKET_TIMESTAMP Linux kernel setting to specify
> the source of packet timestamps. The corresponding Linux kernel patch is
> b
p.org] On Behalf Of Guy Harris
Sent: Friday, May 28, 2010 10:30 PM
To: tcpdump-workers@lists.tcpdump.org
Subject: Re: [tcpdump-workers] [RFC PATCH 0/2]: hw timestamp support
On May 26, 2010, at 9:03 AM, Mcmillan, Scott A wrote:
> Both the 'raw' and 'nic' timestamps are in the
David,
There was no negative feedback on this RFC, and the corresponding tcpdump patch
was well received. Please apply.
Thanks,
Scott
-Original Message-
From: netdev-ow...@vger.kernel.org [mailto:netdev-ow...@vger.kernel.org] On
Behalf Of Mcmillan, Scott A
Sent: Friday, May 21, 2010
This is an updated patch for tcpdump-4.1.1 to add the capability to select hw
timestamps via the -j command line option. The usage has been simplified: -j
now takes no argument, and uses the hw timestamp transformed into the system
clock basis corresponding to "-j nic" from the previous patch.
ren.r...@oracle.com]
Sent: Tuesday, May 25, 2010 7:37 PM
To: Mcmillan, Scott A
Cc: tcpdump-workers@lists.tcpdump.org
Subject: Re: [tcpdump-workers] [RFC PATCH 0/2]: hw timestamp support
Scott,
Is it just the 82580 or others too?
If I look in the source code for OpenSolaris, I see:
igb_82575.h:#d
mp-workers-ow...@lists.tcpdump.org] On Behalf Of Guy Harris
Sent: Tuesday, May 25, 2010 8:37 PM
To: tcpdump-workers@lists.tcpdump.org
Subject: Re: [tcpdump-workers] [RFC PATCH 0/2]: hw timestamp support
On May 24, 2010, at 7:26 AM, Mcmillan, Scott A wrote:
> [My apologies if this double post
; timestamp as part of the packet metadata.
Scott
-Original Message-
From: Darren Reed [mailto:darren.r...@oracle.com]
Sent: Tuesday, May 25, 2010 8:04 PM
To: tcpdump-workers@lists.tcpdump.org
Cc: Mcmillan, Scott A
Subject: Re: [tcpdump-workers] [RFC PATCH 1/2] libpcap: linux
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 se
[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. It also
adds support for the PACKET_TIMESTAMP Linux kernel setting to specify the
source of packet timestamps. The corresponding Li
[My apologies if this double posts. The mail server didn't care for the first
submission.]
This patch adds the general infrastructure needed to select the packet
timestamp source as well as specific support for the PACKET_TIMESTAMP Linux
kernel setting.
Signed-off-by: Scott McMillan
--- a
[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 via the -j
command line option.
Signed-off-by: Scott McMillan
--- a/tcpdump-4.1.1/interface.h 2010-03-11 19:56:44.0 -0600
++
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