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NixOS RISC-V

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NixOS on RISC-V https://wiki.nixos.org/wiki/RISC-V https://pad.lassul.us/NixOS-riscv64-linux https://github.com/orgs/NixOS/teams/risc-v58 Servers

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SenderMessageTime
25 Sep 2025
@rosscomputerguy:matrix.orgTristan RossKinda22:42:24
@rosscomputerguy:matrix.orgTristan RossThe noise from my audio interface is less noticable22:42:34
@rosscomputerguy:matrix.orgTristan Ross And pkgsLLVM.linux took 20 minutes with a GCC built kernel where with the LLVM kernel, it took 15 minutes 22:43:02
@rosscomputerguy:matrix.orgTristan RossI ran the same build under the two kernels 3 times in a row on each kernel and got the same 5 minutes difference22:43:45
@alex:tunstall.xyzAlex
In reply to @rosscomputerguy:matrix.org
The noise from my audio interface is less noticable
It sounds like there is interference between your CPU and your audio interface...
I mean, it shouldn't be driving the sound card differently just because of differences in compiler optimisations and code layout, right?
22:44:24
@rosscomputerguy:matrix.orgTristan RossThe thing is I'm not sure22:44:56
@rosscomputerguy:matrix.orgTristan RossI shouldn't even be getting noise in the first place since it's over USB. Even on my dedicated USB card, I actually get worse audio quality.22:45:22
@alex:tunstall.xyzAlex
In reply to @rosscomputerguy:matrix.org
I ran the same build under the two kernels 3 times in a row on each kernel and got the same 5 minutes difference
This could be due to ld.bfd vs lld (assuming these are what the two stdenvs use for linking). Worth exploring...
22:45:31
@rosscomputerguy:matrix.orgTristan RossI was thinking about asking some people at Ampere since I do have an Ampere CPU and the performance team has done a lot of testing as I've heard.22:46:13
@dramforever:matrix.orgdramforeverlld should be faster than ld.bfd at processing linker relaxations... maybe22:48:05
@dramforever:matrix.orgdramforeveri'm not sure how you would go about profiling this though22:48:21
@dramforever:matrix.orgdramforeveroh nevermind it's not really building a riscv kernel22:48:42
@alex:tunstall.xyzAlex
In reply to @dramforever:matrix.org
i'm not sure how you would go about profiling this though
IIRC there is a function for "just change the linker" for use with replaceStdenv, so the two can be compared in isolation.
22:49:19
26 Sep 2025
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@snektron:matrix.orgSnektronthis group exists19:12:14
@snektron:matrix.orgSnektronhello 19:12:18
@snektron:matrix.orgSnektroni run nixos on my vf219:12:26
@dramforever:matrix.orgdramforeverhello19:32:32
@dramforever:matrix.orgdramforeverwhat do you use it for19:33:02
@snektron:matrix.orgSnektrongathering dust19:41:53
@alex:tunstall.xyzAlex
In reply to @snektron:matrix.org
gathering dust
Great, then you don't even need it to work
20:58:57
27 Sep 2025
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