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Date:      Sun, 29 Oct 2017 19:30:25 -0700
From:      Peter Grehan <grehan@freebsd.org>
To:        Ian Lepore <ian@freebsd.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r325108 - head/sys/amd64/vmm/io
Message-ID:  <66f496cb-c2c4-3044-333e-84540bdd64c2@freebsd.org>
In-Reply-To: <1509330161.21609.86.camel@freebsd.org>
References:  <201710292050.v9TKo3j5058456@repo.freebsd.org> <1509310495.21609.60.camel@freebsd.org> <3b1ffc68-def3-04f6-2a1e-af44d6f3b4a5@freebsd.org> <1509330161.21609.86.camel@freebsd.org>

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Hi Ian,

> In fact I did check maintainers, and I just now checked it again, and
> seeing nothing on-point, wrote a really snarky reply.
>=20
> Luckily, before hitting send I realized you wouldn't have said anything
> unless there was an entry in there, so I checked like 4 more times
> before I noticed the line that begins vmm(4). =C2=A0I had been looking =
for a
> line that began with sys/amd64.
>=20
> So... sorry about that. =C2=A0Should I revert it and open a review?

  No, it's fine. It's a good idea in general for code in that area since=20
there are often unintended side-effects with guest behaviour, and=20
putting up a review can at least flush out folk who might have more=20
insight into that.

  I'll update the maintainer's file to include the directory.

> Longer-term, I was hoping to find some time over the next few weeks to
> further explore the roundoff errors in the timers and attempt a better
> fix, and I was definitely intending to put that up for review
> (especially because it involves math, and I'm always better off asking
> for help with that).

  I know Rod Grimes is going to be doing some testing this week with=20
clock drift in guests, and I'll do some dtrace work on HPET usage with=20
non-FreeBSD guests.

  Timer accuracy has long been an issue with bhyve so any help in this=20
area is much appreciated.

later,

Peter.




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