ixl netmap TX queue remains full

[Vincenzo Maffione]

Hi,
  Could this be related to
https://reviews.freebsd.org/D26896?

Moreover, what happens if you switch the enable_head_writeback sysctl?

Cheers,
  Vincenzo

Il giorno lun 29 mar 2021 alle ore 10:36 Özkan KIRIK <ozkan.kirik at gmail.com>
ha scritto:

> Hello,
>
> I hit problems about ixl driver's netmap support. I have no problems with
> ixgbe.
> The problem is tested with FreeBSD 12.2-p5 and FreeBSD 13.0-RC3.
>
> ixl in netmap mode, it works with low throughput (about 2 Gbps) for 20-30
> seconds. And then TX queue remains full. poll with POLLOUT and even
> ioctl(fd, NIOCTXSYNC) does not work. So that nic stops working.
>
> Same netmap software with ixgbe has no problems.
>
> pciconf -lv output:
> ixl0 at pci0:183:0:0: class=0x020000 card=0x37d215d9 chip=0x37d28086 rev=0x04
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Ethernet Connection X722 for 10GBASE-T'
>     class      = network
>     subclass   = ethernet
> ixl1 at pci0:183:0:1: class=0x020000 card=0x37d215d9 chip=0x37d28086 rev=0x04
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Ethernet Connection X722 for 10GBASE-T'
>     class      = network
>     subclass   = ethernet
> ixl2 at pci0:183:0:2: class=0x020000 card=0x37d015d9 chip=0x37d08086 rev=0x04
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Ethernet Connection X722 for 10GbE SFP+'
>     class      = network
>     subclass   = ethernet
> ixl3 at pci0:183:0:3: class=0x020000 card=0x37d015d9 chip=0x37d08086 rev=0x04
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Ethernet Connection X722 for 10GbE SFP+'
>     class      = network
>     subclass   = ethernet
>
> Best regards
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