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Linux founder Torvalds: Intel x86 is king, but ARM is 'disappointing'

Linus says ARM is 'not very pleasant' and unlikely to dislodge Intel from number one spot

linus-torvalds
  • Graeme Burton
  • @graemeburton
  • 10 October 2016
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LINUX FOUNDER Linus Torvalds has said that ARM is unlikely to dislodge Intel from heavyweight computing as Intel's 'infrastructure' is more unified and open. 

Torvalds made the comments in a Q&A with David Rusling, chief technology officer at ARM tools vendor Linaro, in response to a question about his "favourite architecture".

"It's because of the infrastructure. It's there and it's open in a way that no other architecture is. The instruction set and the core of the CPU is not very important," said Torvalds.

"It's one of those big differentiators that people fixate on, but it really doesn't matter that much in the end. What matters is all the infrastructure around the instruction set, and x86 right now has it and has it at a lot of different levels.

Related: Legends of Linux Part 1: Linus Torvalds

"ARM has it at the low end. There's really no question that if you are in mobile you are pretty much ARM. [But] I've been pretty disappointed in ARM.

"Not as an instruction set, although I've had my issues there, but as a hardware platform it's still not very pleasant to deal with.

"It doesn't have the same kind of unified models around the instruction set that we have in the PC space. It's getting better, but part of it is just the market itself."

The ARM market, he added, historically didn't value rigid compatibility as highly as the PC market, where the need for one application to work on every PC with no problems was a key to its eventually becoming the de facto standard.

"When you don't have compatibility as being a huge deal from hardware vendors' perspectives you end up having a very fragmented market. Realistically, today x86 and ARM are the two big ones. Power has a lot of developers behind it. But we support pretty much everything," said Torvalds.

He added that he isn't "emotionally attached" to any one architecture. As a developer, it's the development platform that counts rather than specific chip architectures.

However, the ARM ecosystem has improved, according to Torvalds. "ARM has gone from being the biggest 'pain point' in the kernel for me to being something I don't need to care about. That's how I want it to be," he said.

"We all know about the issues with vendors who add millions of lines of code and then never actually gets to me. That part is not working, but that's not something I feel is the kernel community's burden to bear. That's something I hope the vendors will end up fixing because it's their problem."

Torvalds also answered questions about his current role and management style. "When we have a problem we need to talk about it very publicly and make sure that people know it's a problem. It's a part of how I work and I think it's important," he said.

Torvalds admitted that he doesn't write much code for the Linux kernel these days and sees his role as project manager making sure everything happens.

"My job has changed a lot over the 25 years or so that I have been doing Linux. That's part of why I like it. I don't do the same thing anymore. If I never ever write another device driver in my life I will be very happy because I've done that [and] I can't do it again," he explained.

"I really loved doing it 20-plus years ago. I don't do it anymore and I don't want to do it anymore."

Instead, Torvalds sees his role in the development of Linux more in terms of communications. "I always thought I was the complete geek: shy and didn't want to talk to people," he said.

"It's actually true. But when I can talk to people through email and don't have to look at them I'm OK and I really enjoy doing communication.

"I read email. I write email. I try to get people to be on the same page and when they are not on the same page I try to nudge them a bit. It's the greatest job ever."

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