Update:
I'm changing my mind, and I believe Rick's TSO patch is fixing things
(sorry). In looking at my notes, it's possible I had lagg on for those
tests. lagg does seem to negate the TSO patch in my case.
kernel.10stable_basicTSO_65535/
- IP_MAXPACKET = 65535;
- manually forced (no if statement) ifp->if_hw_tsomax = IP_MAXPACKET -
(ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
- Verified on boot via printf that ifp->if_hw_tsomax = 65517
- Boot in a NON LAGG environment. ix0 only.
ixgbe's printf is showing packets up to 65530. Haven't run long enough yet
to see if anything will go over 65535
I have this tcpdump running to check packet size.
tcpdump -ennvvXS -i ix0 greater 65518
I do expect to get packets over 65518, but I was just curious to see if any
of them would go over 65535. Time will tell.
In a separate test, If I enable lagg, we have LOTS of oversized packet
problems. It looks like tsomax is definitely not making it through in
if_lagg.c - Any recommendations there? I will eventually need lagg, as I'm
sure will others.
With dtrace, it's showing t_tsomax >= 65518. Shouldn't that not be
happening?
dtrace -n 'fbt::tcp_output:entry / args[0]->t_tsomax != 0 &&
args[0]->t_tsomax >= 65518 / { printf("unexpected tp->t_tsomax: %i\n",
args[0]->t_tsomax); stack(); }'
6 31403 tcp_output:entry unexpected tp->t_tsomax: 65535
kernel`tcp_do_segment+0x2c99
kernel`tcp_input+0x11a2
kernel`ip_input+0xa2
kernel`netisr_dispatch_src+0x5e
kernel`ether_demux+0x12a
kernel`ether_nh_input+0x35f
kernel`netisr_dispatch_src+0x5e
kernel`bce_intr+0x765
kernel`intr_event_execute_handlers+0xab
kernel`ithread_loop+0x96
kernel`fork_exit+0x9a
kernel`0xffffffff80c75b2e
3 31403 tcp_output:entry unexpected tp->t_tsomax: 65535
kernel`tcp_do_segment+0x2c99
kernel`tcp_input+0x11a2
kernel`ip_input+0xa2
kernel`netisr_dispatch_src+0x5e
kernel`ether_demux+0x12a
kernel`ether_nh_input+0x35f
kernel`netisr_dispatch_src+0x5e
kernel`bce_intr+0x765
kernel`intr_event_execute_handlers+0xab
kernel`ithread_loop+0x96
kernel`fork_exit+0x9a
kernel`0xffffffff80c75b2e
6 31403 tcp_output:entry unexpected tp->t_tsomax: 65535
kernel`tcp_do_segment+0x2c99
kernel`tcp_input+0x11a2
kernel`ip_input+0xa2
kernel`netisr_dispatch_src+0x5e
kernel`ether_demux+0x12a
kernel`ether_nh_input+0x35f
kernel`netisr_dispatch_src+0x5e
kernel`bce_intr+0x765
kernel`intr_event_execute_handlers+0xab
kernel`ithread_loop+0x96
kernel`fork_exit+0x9a
kernel`0xffffffff80c75b2e
1 31403 tcp_output:entry unexpected tp->t_tsomax: 65535
kernel`tcp_do_segment+0x2c99
kernel`tcp_input+0x11a2
kernel`ip_input+0xa2
kernel`netisr_dispatch_src+0x5e
kernel`ether_demux+0x12a
kernel`ether_nh_input+0x35f
kernel`netisr_dispatch_src+0x5e
kernel`bce_intr+0x765
kernel`intr_event_execute_handlers+0xab
kernel`ithread_loop+0x96
kernel`fork_exit+0x9a
kernel`0xffffffff80c75b2e
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