From: "james palmer" <james@biobuf.link>
To: 9front@9front.org
Subject: Re: [9front] VMX improvements + AVX
Date: Fri, 04 Dec 2020 21:15:26 +0000 [thread overview]
Message-ID: <4a5d5248-6502-4cd2-a094-380654be651f@www.fastmail.com> (raw)
In-Reply-To: <52CB3E735527EF01CDF9E2641E3A406B@gmail.com>
On Fri, 4 Dec 2020, at 3:39 PM, Sigrid Solveig Haflínudóttir wrote:
> Hello. I made some changes to /sys/src/9/^(pc pc64) and
> /sys/src/cmd/vmx to get better support for Linux and OpenBSD emulation
> and before I push it (or not) I'd like to get more eyes (and hands) on
> it. 386 kernel should not be affected by the change at all, this is
> about amd64 specifically.
>
> Changes were tested on two machines I have, with AVX enabled/disabled.
> No problems were found with extensive use, nor any performance issues
> detected.
>
> On the host Go is using AVX successfully with this change. I'm
> writing optimized routines related to video playback so that's yet
> another reason why this work has been done in the first place.
>
> * AVX/AVX2 support on amd64 for both 9front kernel itself + VMX
> guests. Enabled by setting "*avx=" in plan9.ini.
> * Make vmx(1) report to guest it's running under a hypervisor.
> * Provide "fast strings" (through msr) properly to guests.
> * Rework cpuid in vmx(1).
> * A bit better timing by using tsc offset feature. Clock is still
> wrong but at least not THAT much. Proper kvm clock implementation
> in the future will address that.
>
> Thanks.
>
> - Sigrid
seems to work fine on my box. i'm seeing better performance in my debian vm too. i haven't done any testing though.
- james
next prev parent reply other threads:[~2020-12-04 21:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-04 15:39 Sigrid Solveig Haflínudóttir
2020-12-04 21:15 ` james palmer [this message]
2020-12-04 22:25 ` Kurt H Maier
2020-12-05 0:19 ` ori
2020-12-10 12:23 ` Stuart Morrow
2020-12-10 15:09 ` ori
2020-12-18 2:22 ` magma698hfsp273p9f
2020-12-18 4:41 ` ori
2021-01-21 0:58 ` Nemo's books (WAS: Re: [9front] VMX improvements + AVX) magma698hfsp273p9f
2021-01-21 3:37 ` Roman Shaposhnik
2021-01-21 3:58 ` sl
2021-01-23 7:31 ` [9front] Re: Nemo's books magma698hfsp273p9f
2021-01-23 12:47 ` Eckard Brauer
2021-01-21 4:07 ` Nemo's books (WAS: Re: [9front] VMX improvements + AVX) Anthony Martin
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