Date: Fri, 20 Jul 2012 14:50:50 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: Awful FreeBSD 9 block IO performance in KVM Message-ID: <jubk7a$l8m$1@dough.gmane.org> In-Reply-To: <50085193.6030203@gentoo.org> References: <50085193.6030203@gentoo.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigB843B65CBADBF2E7187E52BE Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 19/07/2012 20:27, Richard Yao wrote: > Dear Everyone, >=20 > FreeBSD 9 has awful block IO performance in KVM. I have experienced it > and others have experienced it. Someone posted slides to slideshare wit= h > benchmarks documenting it: >=20 > http://www.slideshare.net/TakeshiHasegawa1/runningfreebsdonlinuxkvm >=20 > Slides 13 and 20 are particular eye openers. Does anyone know what is w= rong? I'm interested in seeing if the difference is still large while writing to a raw device (dd of=3D/dev/xxx bs=3D1m count=3D1000) vs writing to the= file system. Can you test this? --------------enigB843B65CBADBF2E7187E52BE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlAJVCoACgkQ/QjVBj3/HSzzcQCeKWOyGCczi54Zi/YLR51iZDnx TakAnjDF3amHhoBbvdcR97F3sbW6Q8lH =7Ryh -----END PGP SIGNATURE----- --------------enigB843B65CBADBF2E7187E52BE--
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