* PF_PACKET: packets out of order
@ 2001-10-08 23:32 Joerg Schumacher
2001-10-08 23:43 ` David S. Miller
0 siblings, 1 reply; 3+ messages in thread
From: Joerg Schumacher @ 2001-10-08 23:32 UTC (permalink / raw)
To: linux-kernel
Hi!
NeTraMet v44b10 uses pcap(3) and complains about timestamps jumping
backwards. Looks like a PF_PACKET socket doesn't receive the packets
in the correct order. Some timestamps from a "tcpdump -tt":
RX: 1001465480.175100 [...]
TX: 1001465480.179111 [...]
RX: 1001465480.177315 [...]
^^^^^^
TX: 1001465480.180514 [...]
RX: 1001465480.179706 [...]
Some more figures (obtained with a quick hack using libpcap-2001.09.25
on two different machines):
2.2.19:
stats: 100000 packets received
0 packets dropped
good: 90222 packets
bad: 9778 packets
max delta: 15850 usec
2.4.1:
stats: 100000 packets received
0 packets dropped
good: 99538 packets
bad: 462 packets
max delta: 471 usec
Any plans to fix this in the kernel?
Regards,
Joerg
--
Gaertner Datensysteme 38114 Braunschweig
Joerg Schumacher Hamburger Str. 273a
Tel: 0531-2335555 Fax: 0531-2335556
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: PF_PACKET: packets out of order
2001-10-08 23:32 PF_PACKET: packets out of order Joerg Schumacher
@ 2001-10-08 23:43 ` David S. Miller
2001-10-09 1:43 ` Joerg Schumacher
0 siblings, 1 reply; 3+ messages in thread
From: David S. Miller @ 2001-10-08 23:43 UTC (permalink / raw)
To: schuma; +Cc: linux-kernel
From: Joerg Schumacher <schuma@gaertner.de>
Date: Tue, 9 Oct 2001 01:32:16 +0200 (MET DST)
Hi!
NeTraMet v44b10 uses pcap(3) and complains about timestamps jumping
backwards. Looks like a PF_PACKET socket doesn't receive the packets
in the correct order. Some timestamps from a "tcpdump -tt":
RX: 1001465480.175100 [...]
TX: 1001465480.179111 [...]
RX: 1001465480.177315 [...]
^^^^^^
TX: 1001465480.180514 [...]
RX: 1001465480.179706 [...]
The receive packets are in order, as are the transmit packets.
Anything which absolutely _requires_ all TX and RX packets to
be in precise order, should really be fixed not to have such
a weird restriction.
Franks a lot,
David S. Miller
davem@redhat.com
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: PF_PACKET: packets out of order
2001-10-08 23:43 ` David S. Miller
@ 2001-10-09 1:43 ` Joerg Schumacher
0 siblings, 0 replies; 3+ messages in thread
From: Joerg Schumacher @ 2001-10-09 1:43 UTC (permalink / raw)
To: David S. Miller; +Cc: linux-kernel
On Mon, Oct 08, 2001 at 04:43:37PM -0700, David S. Miller wrote:
> [...]
> Anything which absolutely _requires_ all TX and RX packets to
> be in precise order, should really be fixed not to have such
> a weird restriction.
Do humans qualify as "anything" ;-)? Until I saw the "LastTime jump
backward" warning in netramet I used to read the tcpdump output line
by line without checking the timestamps. Neither packet(7) nor
tcpdump(1) indicate that I should do so.
Regards,
Joerg.
--
Gaertner Datensysteme 38114 Braunschweig
Joerg Schumacher Hamburger Str. 273a
Tel: 0531-2335555 Fax: 0531-2335556
^ permalink raw reply [flat|nested] 3+ messages in thread
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2001-10-08 23:32 PF_PACKET: packets out of order Joerg Schumacher
2001-10-08 23:43 ` David S. Miller
2001-10-09 1:43 ` Joerg Schumacher
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