The watched kettle never boiled. No more crashes in over two weeks
(instead of two in the first week). I tried a loop of alternating iperf3
tcp and udp to no ill effect. I still see the growth in the metrics I
reported, yet the system remained stable.
I applied the patch below and am still collecting the metrics. I doubt
they are responsible for the original problem.
Thanks
Greg
Moritz Buhl <mb...@openbsd.org> writes:
> Hi Greg, Hi Joe,
>
> dlg@ hinted to me that the ring might overwrite it's own starting
> position with the current code.
>
> Does this help?
> mbuhl
>
> Index: dev/pci/if_igc.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/pci/if_igc.c,v
> retrieving revision 1.9
> diff -u -p -r1.9 if_igc.c
> --- dev/pci/if_igc.c 2 Jun 2022 07:41:17 -0000 1.9
> +++ dev/pci/if_igc.c 8 Nov 2022 10:35:39 -0000
> @@ -978,7 +978,7 @@ igc_start(struct ifqueue *ifq)
> mask = sc->num_tx_desc - 1;
>
> for (;;) {
> - if (free <= IGC_MAX_SCATTER) {
> + if (free <= IGC_MAX_SCATTER + 1) {
> ifq_set_oactive(ifq);
> break;
> }
> @@ -1005,6 +1005,7 @@ igc_start(struct ifqueue *ifq)
> /* Consume the first descriptor */
> prod++;
> prod &= mask;
> + free--;
> }
>
> for (i = 0; i < map->dm_nsegs; i++) {
