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Subject: Re: Problem with FreeBSD as a XenServer Guest - how to debug?
To: freebsd-stable@freebsd.org,Rainer Duffner <rainer@ultra-secure.de>
From: Florian Ermisch <florian.ermisch@alumni.tu-berlin.de>
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Hi Rainer,

isn't Amazon AWS xen-based?
I know Colin Percival (cperciva@) is running=20
tarsnap=2Ecom on AWS, maybe he knows how=20
to tune it properly?
Looks like he's the one providing FreeBSD=20
images for AWS, too: https://aws=2Eamazon=2Ecom/marketplace/pp/B01LWSWRED/
Amazon is probably running a heavily patched
version of Xen but looking at the images'=20
sysctls & stuff and running one on your Xen-
Server might provide some insights - or at
least datapoints=2E

And then there's DTrace to dive into the=20
kernel's inner workings*=E2=80=A6

Oh, does Xen still provide emulation for other
storage controllers like SATA or SAS? If so
you may get an at least bearable performance
using those=2E

Regards, Florian

Am 4=2E Februar 2017 01:12:11 MEZ schrieb Rainer Duffner <rainer@ultra-sec=
ure=2Ede>:
> Hi,
>=20
> I=E2=80=99ve opened a PR on this:
>=20
> https://bugs=2Efreebsd=2Eorg/bugzilla/show_bug=2Ecgi?id=3D212681
>=20
> and asked on freebsd-virtualization=2E But nothing came out of it=2E
>=20
> Basically, I/O is very slow inside the FreeBSD guest=2E Linux guests are
> OK=2E
> FreeBSD 10 or 11 doesn=E2=80=99t make a difference=2E
> Haven=E2=80=99t been able to try 12=2E
>=20
>=20
> How can one debug this?
>=20
>=20
>=20
>=20
> Rainer
> _______________________________________________
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