From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zan Lynx Subject: Interesting observation on Reiser4 flush delays and IO scheduler Date: Thu, 02 Aug 2007 14:28:28 -0600 Message-ID: <1186086508.14479.14.camel@localhost> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-+9n5iDXPkwxkiNFqUcHt" Return-path: Sender: reiserfs-devel-owner@vger.kernel.org List-Id: To: ReiserFS Mailing List --=-+9n5iDXPkwxkiNFqUcHt Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On my laptop while running heavy disk read/write loads, I have discovered that the deadline IO scheduler gives me a much better "feel" and much shorter (and fewer) system freezes. This is as compared to the CFQ scheduler. I'm not sure why this is yet. A rough guess is that Reiser4's atom merging, etc, is not preserving the data CFQ needs to time slice and prioritize disk IO. But I don't have any evidence for this guess. Is it plausible? Something to think about. --=20 Zan Lynx --=-+9n5iDXPkwxkiNFqUcHt Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.5 (GNU/Linux) iD8DBQBGsj5sG8fHaOLTWwgRAsyPAKCp3eYJOSSFHRkJ0z5zhX/KB6zSAQCeP6hl 4u5ua9kqavRE029z3/cZ7mA= =0XYc -----END PGP SIGNATURE----- --=-+9n5iDXPkwxkiNFqUcHt--