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Date:      Thu, 15 Jan 2015 14:25:02 -0600
From:      Bryan Venteicher <bryanv@daemoninthecloset.org>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        emulation@freebsd.org, FreeBSD-Current <freebsd-current@freebsd.org>
Subject:   Re: DigitalOcean offers VMs with FreeBSD!
Message-ID:  <CAMo0n6QLmEXVGVkgRXsov5VOY87VuJkEERzzhHr1fM2jFToO1g@mail.gmail.com>
In-Reply-To: <20150115154443.GA10325@zxy.spb.ru>
References:  <54B7A494.50205@FreeBSD.org> <54B7DC97.7050809@FreeBSD.org> <20150115154443.GA10325@zxy.spb.ru>

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On Thu, Jan 15, 2015 at 9:44 AM, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:

> On Thu, Jan 15, 2015 at 06:28:23PM +0300, Lev Serebryakov wrote:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA512
> >
> > On 15.01.2015 14:29, Lev Serebryakov wrote:
> >
> > >
> https://www.digitalocean.com/company/blog/presenting-freebsd-how-we-made-=
it-happen/
> > >
> > >  I didn't see this news on mailing lists :)
> >  But here are some thread about FreeBSD is way slower than Linux in
> > these virtual installations
> >
> > https://news.ycombinator.com/item?id=3D8888487
>
> May be IOPS quotation?
> Can you test with dd and custom kernel with MAXPHYS=3D1048576 ?
>


=E2=80=8BWhat's the value of kern.timecounter.hardware? It will likely be e=
ither
HPET or ACPI which means there is an VM exit whenever the guest reads from
the emulated timecounter hardware. That's why I have some WIP to add
support for KVMCLOCK [1]. I hope to merge those changes to HEAD in a week
and STABLE shortly after.

In the meanwhile, not completely foolproof workaround is to use the TSC-low
timecounter source.

[1] -
https://lists.freebsd.org/pipermail/freebsd-arch/2015-January/016587.html



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