ixl netmap TX queue remains full

[Özkan KIRIK]

Hello Vincenzo,

Before your email, hw.ixl.enable_head_writeback = 1. After your suggestion,
i set the hw.ixl.enable_head_writeback = 0. then it works properly.

Thank you so much

Cheers
Özkan

On Tue, Mar 30, 2021 at 9:22 AM Vincenzo Maffione <vmaffione at freebsd.org>
wrote:

> 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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>