ixl netmap TX queue remains full

[Vincenzo Maffione]

Hi Özkan,
I'm glad that worked.
Nevertheless, there must be an issue lurking around in the ixl driver code,
affecting the case enable_head_writeback==1.
It may be related to the fact that https://reviews.freebsd.org/D26896
causes issues, even though it looks a legitimate change.

Cheers,
Vincenzo

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

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 <

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.
rev=0x04
hdr=0x00
vendor = 'Intel Corporation'
device = 'Ethernet Connection X722 for 10GBASE-T'
class = network
subclass = ethernet
rev=0x04
hdr=0x00
vendor = 'Intel Corporation'
device = 'Ethernet Connection X722 for 10GBASE-T'
class = network
subclass = ethernet
rev=0x04
hdr=0x00
vendor = 'Intel Corporation'
device = 'Ethernet Connection X722 for 10GbE SFP+'
class = network
subclass = ethernet
rev=0x04
hdr=0x00
vendor = 'Intel Corporation'
device = 'Ethernet Connection X722 for 10GbE SFP+'
class = network
subclass = ethernet
Best regards
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