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https://www.intel.com/content/www/us/en/support/articles/000007456/ethernet-products.html

https://github.com/freebsd/freebsd-src/blob/releng/14.1/sys/dev/igc/if_igc.c    (freebsd 14.1)

https://github.com/freebsd/freebsd-src/commit/4c1441bba1d1bcc5a8237c97f136bf7e3cc77058#diff-b3c4dec5c5f214ce7f66e8fe5c7667c2a935a966d7b75da4719db52f0fc64defR498    (freebsd 14.2)

sorry for the late reply, I'm a over 10 years League of Legends gaming user, I've used different nic and routers, I've found that there is a difference in latency and jitter,  Ping doesn't reflect the real response time of the game, so I build a pc to install opensense. all the settings are designed to get a lower latency.

in my case i put txintdelay to 0 is work, compared to the default value(txintdelay 66),  effect is very obvious. The default setting latency is very high (I don't mean ping, I mean real response time).  I tested a long time. if put txintdelay to 0,old igc driver latency is better than new driver. i hope the old feature will available on the new driver.

my opnsense spec:
cpu:i5 3470
ram:2x8g ddr3 1600
sata ssd:128g
nic:i225-v x4 pcie 2.0x4  (nvm 1.94)
no gpu and disable onboard nic

my opnsense setting(kernel 24.7.6)

Code Select Expand


net.isr.bindthreads="1"
hw.igc.rx_int_delay="0"
hw.igc.tx_int_delay="0"
hw.igc.rx_abs_int_delay="0"
hw.igc.tx_abs_int_delay="0"
dev.igc.0.iflib.override_nrxds="4096"
dev.igc.1.iflib.override_nrxds="4096"
dev.igc.2.iflib.override_nrxds="4096"
dev.igc.3.iflib.override_nrxds="4096"
dev.igc.0.iflib.override_ntxds="4096"
dev.igc.1.iflib.override_ntxds="4096"
dev.igc.2.iflib.override_ntxds="4096"
dev.igc.3.iflib.override_ntxds="4096"
dev.igc.0.iflib.override_nrxqs="1"
dev.igc.1.iflib.override_nrxqs="1"
dev.igc.2.iflib.override_nrxqs="1"
dev.igc.3.iflib.override_nrxqs="1"
dev.igc.0.iflib.override_ntxqs="1"
dev.igc.1.iflib.override_ntxqs="1"
dev.igc.2.iflib.override_ntxqs="1"
dev.igc.3.iflib.override_ntxqs="1"
dev.igc.0.fc="0"
dev.igc.0.itr="0"
dev.igc.1.fc="0"
dev.igc.1.itr="0"
dev.igc.2.fc="0"
dev.igc.2.itr="0"
dev.igc.3.fc="0"
dev.igc.3.itr="0"

disable checksum offload,TSO and LRO.

thank for help. now i restore old kernel to fix it.

intel i225-v x4

In the past i have always put txintdelay to 0,gaming delay respond is fast. but new igc driver respond too bad very slow. I'm looking to roll back the old driver.  :'(

miss value:
hw.igc.rx_int_delay
hw.igc.rx_abs_int_delay
hw.igc.tx_int_delay
hw.igc.tx_abs_int_delay
https://man.freebsd.org/cgi/man.cgi?query=igc

now

Code Select Expand

root@OPNsense:~ # sysctl -a | grep hw.igc
hw.igc.max_interrupt_rate: 8000
hw.igc.enable_aim: 0
hw.igc.eee_setting: 1
hw.igc.sbp: 1
hw.igc.smart_pwr_down: 0
hw.igc.disable_crc_stripping: 0


how to restore old driver?