sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv | Matrix: #riscv:catircservices.org
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* bjdooks farts in drewfustini's general direction
<drewfustini> Hehe, good to see you at the summit
<bjdooks> any plans for lunch?
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<bjdooks> hmm, is Linux on RISCV lacking much for preempt-rt ?
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<Tenkawa> bjdooks: I imagine its nowhere close yet other than for fpga chips..
<jrtc27> didn't it get turned on a couple of months back?
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<bjdooks> you can do it on other arches, is there stuff actually missing in the kernel for risv
<bjdooks> i thought mostly it is now just in the kenrel
<Tenkawa> jrtc27: for other arches yes.. not risc-v if I'm reading correctly
<jrtc27> ah the thread still has activity
<jrtc27> at least looking at <20240906111841.562402-4-bigeasy@linutronix.de>
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<Tenkawa> I see nothing in mainline thats been approved yet
<Tenkawa> I've put my RISC-V activity on hold for now as you probably saw.... I'm waiting on 6.13
<Tenkawa> So back to ARM64 for me...
<Tenkawa> (just not on Linux)
<bjdooks> yeah, i thought mostly prempt-rt is mostly just working
<bjdooks> atm i've got no time for anything that isn't work (crappy arm64 stuff) or a kitchen floor
<Tenkawa> heh
<bjdooks> the sort of questions like "i'm doing 2000 spi transactions a second, why is my cpu using 60% of a core"
<Tenkawa> bjdooks: you might need to look for system overhead...
<bjdooks> yeah, the answer is that partly their crappy hyperivosr dma code is crap
<Tenkawa> things like sysctl settings on swappiness can cause io hits that will make more decisions have to be made
<bjdooks> 200us to setup the dma for a 300us transactiin
<Tenkawa> I learned that just in x86 and arm
<Tenkawa> just small decision making calls that aren't needed
<Tenkawa> 20% vs 1%
<Tenkawa> for example
<bjdooks> oh, and 100us a transaction on power management
<Tenkawa> yeah
<Tenkawa> things like that
<bjdooks> and a bug where it doens't rleease the dma channels on rmmod so you can't test the driver again
<bjdooks> because the pio is just worse
<Tenkawa> oh yeah... thats "fun"
<bjdooks> and the 9 day wait for the documentation to allow to actually do the work
<bjdooks> the drivre spends most of the time in a spin_lock_irq section to nicely stop most perfing
<bjdooks> I'm the third person to look at this and the first to actually get somewhere past the IDK, blame the middleware
<Tenkawa> I'm just waiting at this point until it all hits mainline I think..
<Tenkawa> only thing I have right now is the VF2 thats close
<bjdooks> the preempt-rt patches have been getting significantly smaller and most targetitng a small set of drivers
<Tenkawa> My other RV boxes "normal" kernels are still a mess
<bjdooks> I was going to do some analysis but didn't get around to running some checks on how each specific areahas been going
<Tenkawa> One is improving but slowly.....
<bjdooks> we're doing some rt testing over arm64 and x86_64
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