freebsd 14.2 igc driver hw.igc.tx_int_delay miss

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peterchan9

I'm a league of legends gaming user, delay is important to me. I found freebsd 14.2 updated igc driver and miss a lot of value, gaming latency increase. In the past i have always put txintdelay to 0 gaming latency is good and stable.
miss value:
hw.igc.rx_int_delay
hw.igc.rx_abs_int_delay
hw.igc.tx_int_delay
hw.igc.tx_abs_int_delay

why did you delete it? will it come back? I need it, because it make a gaming latency lower.
 
Haven't these moved to hw.em? The 'old' igb(4) driver got merged into the em(4) driver some time ago.

Code: 
       hw.em.rx_int_delay
	       This value delays the generation	of receive interrupts in units
	       of  1.024 microseconds.	The default value is 0,	since adapters
	       may hang	with this feature being	enabled.

       hw.em.rx_abs_int_delay
	       If hw.em.rx_int_delay is	non-zero, this tunable limits the max-
	       imum delay in which a receive interrupt is generated.

       hw.em.tx_int_delay
	       This value delays the  generation  of  transmit	interrupts  in
	       units of	1.024 microseconds.  The default value is 64.

       hw.em.tx_abs_int_delay
	       If hw.em.tx_int_delay is	non-zero, this tunable limits the max-
	       imum delay in which a transmit interrupt	is generated.

       hw.em.max_interrupt_rate
	       Maximum interrupts per second.  The default value is 8000.

       hw.em.rx_process_limit
	       Maximum	number	of  received  packets to process at a time, -1
	       means unlimited.	 The default value is 100.
 
new igc driver, i obviously feel the game is slower (example character movement, skill and attack speed slower). this reflects gaming latency increase, but the game ping is not change.

i hope the old features will come back. it too important to me.

my nic i225-v x4
 
no. i test a long time(old or new driver), maybe you're not a game user, I'm pretty sure the new driver missing values that are slow down the game.
 
I don't have actual data to prove that it slows down the game or latency increase. I only test the impact of new and old drivers on game latency. I'm pretty sure put txintdelay to 0 gaming latency lower in old driver. I think it make upload latency lower, gaming response faster and stable.
 
github.com

igc: Add sysctl for DMA Coalesce · freebsd/freebsd-src@4c1441b

This feature can increase efficiency at the expense of latency It does not work well with the default interrupt delay, but expose the otherwise unconnected code in the driver in case people want t...
github.com github.com

www.intel.com

Direct Memory Access (DMA) Coalescing

Describes DMA Coalescing and how to enable and tune it to improve system energy efficiency.
www.intel.com www.intel.com

 
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