Date: Fri, 3 Feb 2012 21:47:08 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: arch@freebsd.org Subject: Re: Prefaulting for i/o buffers Message-ID: <20120203194708.GC3283@deviant.kiev.zoral.com.ua> In-Reply-To: <CAJ-FndDyFBQvmg1sBXfdZij6jC=WvWoYDBBurAOg=q36mdcPYw@mail.gmail.com> References: <20120203193719.GB3283@deviant.kiev.zoral.com.ua> <CAJ-FndDyFBQvmg1sBXfdZij6jC=WvWoYDBBurAOg=q36mdcPYw@mail.gmail.com>
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--7KvBbaRjXS2SFKKp Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Feb 03, 2012 at 07:40:37PM +0000, Attilio Rao wrote: > Do you have an ETA for reviews? When do you plan to commit this? Obviously, I cannot have an ETA for reviews, and I am not sure that I get any review at all (as usual). I think it is reasonable to commit in 2-3 weeks after the first post. > it would be valuable to get a grasp on the benchmark and refine the > performance difference as much as possible. The benchmark is trivial and available at=20 http://people.freebsd.org/~kib/misc/bench_read.c There is also a targeted test for uio functionality http://people.freebsd.org/~kib/misc/uio.c which I used together with intensive swapping workload to verify the correctness of the patch. Regarding the performance hit, I consider the < 10% on the worst case a reasonable cost for finally fixing this issue. If anybody can provide a benchmark result for e.g. postgresql tests, I will be very grateful. --7KvBbaRjXS2SFKKp Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk8sObwACgkQC3+MBN1Mb4jLCQCeIBu368//Hwq4rZmtqcUQgVRP Yq4AoONvlv43L7ABlzDggAPBNbCDz2vV =FQiX -----END PGP SIGNATURE----- --7KvBbaRjXS2SFKKp--
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