Intel's I219-LM Gigabit Ethernet Adapter Ran at 60% Maximum Speed on Linux Since...
source link: https://slashdot.org/story/23/04/22/0554251/intels-i219-lm-gigabit-ethernet-adapter-ran-at-60-maximum-speed-on-linux-since-2020
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Intel's I219-LM Gigabit Ethernet Adapter Ran at 60% Maximum Speed on Linux Since 2020
Phoronix reports:
If you rely on an Intel I219-LM Gigabit Ethernet adapter, you will want to look forward to upgrading your Linux kernel build soon... A fix was committed Thursday after Intel engineers discovered this particular Ethernet chipset had only been running at around 60% of its maximum speed due to a regression introduced back in 2020... Since the release of Linux 5.8 in mid-2020, this Ethernet adapter had been running at around 60% of its advertised potential due to an e1000e driver regression.
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Obviously they didn't test it enough.
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It has been challenging to get Intel to take Linux support seriously.
I had a case open for driver issues with this chip i.e. including huge performance differences between their Linux and Windows drivers.
They kept not doing anything about it so I gave up and changed hardware to something that worked. Glad they finally fixed that.-
I concur with @rhardy. And it's not just for the I219-LM. The situation with the igc driver for the I-225V chipset is a real debacle that makes it unusable for most users. Windows as well as Linux users have problems. People expect better from Intel since it's a top name in the industry.
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Yeah, I know that for a while when I was shopping around for motherboard/laptop type systems, that "Intel" network connection was a positive thing for me. Might mean my picking one system over another if they're of similar price.
Yes, I would check reviews semi-regularly, but generally the intel stuff was noted for being stable and dependable. You can't really increase speed over the standard, of course. But an assurance of "it just works" for something peripheral is something you want.
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Most Linux code reviewers, the people that actually sign off the code before it's sent to Linus as a "git pull", compile the proposed changes.
If the compile works, then they look for unexpected interactions with other parts of Linux, and if none are found THEY MIGHT DO ACTUAL TESTS
Much of the Linux codebase lacks rigorous and documented performance & regression testing. Yes, more and more programmers are including module tests and better code building checks in their code packages, but I have rarely se
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Running Windows?
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Not unless the router has this Intel chip in it.
Let's use an example: A Linux box with this Intel I219-LM in it and a Mac mini, both hardwired to a router rated for 1,000 Mbps speeds (gigabit). Both devices are rated for 1,000 Mbps operation. The Mac mini would be able to push data to the router at 1,000 Mbps no problem. The Linux box with the faulty driver would only see speeds in the range of 600 Mbps because of this bug.
Of course if this is your house and your ISP only offers you 100 Mbps operation y
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This bug only hits in 10/100 mode. If you are in Gigabit mode, you are unaffected. I looked at the commit to try to figure out if it affects I219-V (still don't know).
The reason the feature wasn't disabled? For some reason, they set the flags in the watchdog code instead of the hardware probe code.
Source: https://git.kernel.org/pub/scm... [kernel.org]
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According to a post down below this only affected the 10/100 mode and not the 1000 mode so that is probably why few people noticed and no one filed a bug report until now.
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It doesn't matter what something is. Fix, workaround, legit feature... if it worked on one release and not the next it is a regression.
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