Date: Wed, 29 Jun 2016 17:01:28 -0700 From: Bryan Drewery <bdrewery@FreeBSD.org> To: Colin Percival <cperciva@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r302288 - head/release/tools Message-ID: <7a41dac2-87b8-c255-391d-fce3d57e835a@FreeBSD.org> In-Reply-To: <201606292356.u5TNuODh057121@repo.freebsd.org> References: <201606292356.u5TNuODh057121@repo.freebsd.org>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --kFAJlTvqXbleNAlEF6hDkXpRO6RcgDN24 Content-Type: multipart/mixed; boundary="tUvFVvcWuusfVLbU95PubWgdOKgVx7iNk" From: Bryan Drewery <bdrewery@FreeBSD.org> To: Colin Percival <cperciva@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Message-ID: <7a41dac2-87b8-c255-391d-fce3d57e835a@FreeBSD.org> Subject: Re: svn commit: r302288 - head/release/tools References: <201606292356.u5TNuODh057121@repo.freebsd.org> In-Reply-To: <201606292356.u5TNuODh057121@repo.freebsd.org> --tUvFVvcWuusfVLbU95PubWgdOKgVx7iNk Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 6/29/2016 4:56 PM, Colin Percival wrote: > Author: cperciva > Date: Wed Jun 29 23:56:24 2016 > New Revision: 302288 > URL: https://svnweb.freebsd.org/changeset/base/302288 >=20 > Log: > Enable indirect segment I/Os by default in the Xen blkfront driver wh= en > running on EC2. Due to improvements in EC2, the performance penalty = which > was present on some EC2 instances no longer exists, and enabling this= > feature now consistently yields ~20% higher throughput with equal or = lower > latency. Does this rely on any driver updates / is it safe to make the same change on my existing 10.2 system? > =20 > Reverts: r286063 > Approved by: re (gjb) > MFC after: 2 weeks > Relnotes: Improved disk throughput on EC2 >=20 > Modified: > head/release/tools/ec2.conf >=20 > Modified: head/release/tools/ec2.conf > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D > --- head/release/tools/ec2.conf Wed Jun 29 23:33:44 2016 (r302287) > +++ head/release/tools/ec2.conf Wed Jun 29 23:56:24 2016 (r302288) > @@ -72,11 +72,6 @@ vm_extra_pre_umount() { > # nodes, but apply the workaround just in case. > echo 'hw.broken_txfifo=3D"1"' >> ${DESTDIR}/boot/loader.conf > =20 > - # Some EC2 instances suffer a significant (~40%) reduction in > - # throughput when using blkif indirect segment I/Os. Disable this > - # by default for now. > - echo 'hw.xbd.xbd_enable_indirect=3D"0"' >> ${DESTDIR}/boot/loader.con= f > - > # Some EC2 instances run on a version of Xen which has a bug relating= > # to the migration of MSI-X interrupts; this is visible as SR-IOV > # networking (aka. "EC2 Enhanced Networking") not being able to pass >=20 --=20 Regards, Bryan Drewery --tUvFVvcWuusfVLbU95PubWgdOKgVx7iNk-- --kFAJlTvqXbleNAlEF6hDkXpRO6RcgDN24 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 iQEcBAEBAgAGBQJXdGFYAAoJEDXXcbtuRpfPhOQIANnWpgD14s0bbiapmsAXohGL Aw4ZpTz0SNKF4z7bBFdFDWFuUoFdqXDsmz8CLDQCFFqWL3Okph+49A52jWvKLC+B ovnGP9M+qook/a8J7QM75yrJUxOgK6Q1JmFaO5H8D7WYVKGnNvKTL10mzzsJ6unI Wu7en3JbEAhSnRygmDybSSneVlQorCntQg0JCLYM4blclX2bHASE0TvvQjBVksP7 FkAmN1/qWe+/wz98n7RR6rRgZQGMRTJ+0UsZrk2uW3CjscVIiAK0UygXcur9DKJC K0ADT8iVo28hY8QSoQ/3iXu/1bGP9G2TymFgqGrGSffV37bVOIQS8mkAjoc+19I= =oAHN -----END PGP SIGNATURE----- --kFAJlTvqXbleNAlEF6hDkXpRO6RcgDN24--
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