Re: Slow TCP throughput/Out of Order Packets in NetBSD 10.0

[Greg Troxel <gdt%lexort.com@localhost>]

Kevin Bowling <kevin.bowling%kev009.com@localhost> writes:

> I have noted slow TCP performance to distant hosts on NetBSD 10.0.
> For instance cloning pkgsrc-wip from git is 4-8KBps on an
> unconstrained system and network that should be capable of MBps.
> Taking a look at netstat -s, I noticed a lot of out of order packets
> which would explain things.
>
> T480 with wm0 configured using dhcpcd.  Updating the laptop to
> -current fixed the issue.  Is this known and something pulled up to
> stable?

I don't know, but

  You could disable various offloading to see if one of them is flaky.
  This is the usual suspect.

  You could find if_wm.c and read the cvs history.

  of course this could be about the stack in general and not wm and
  perhpas your particular wm chip, but if so, I probably would have
  heard about it and remember


from a wm0 I have:

        capabilities=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx>
        capabilities=7ff80<TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx>
        capabilities=7ff80<TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
        enabled=0
        ec_capabilities=17<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,EEE>
        ec_enabled=3<VLAN_MTU,VLAN_HWTAGGING>