Date: Tue, 14 Apr 2009 19:00:43 +0200 From: Roman Divacky <rdivacky@freebsd.org> To: current@freebsd.org Cc: attilio@freebsd.org Subject: IO related interactivity regression in recent -current Message-ID: <20090414170043.GA51803@freebsd.org>
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--DocE+STaALJfprDB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline hi in recent weeks I am observing sudden drop of interactivity which is related to IO. thats is - when one process does IO and another tries to issue some IO as well the second one is terribly starved. nice testcase is: long running compilation in 1 window pkg_version -vl "<" in another window the pkg_version takes A LONG time to finish example: (on idle system) witten ~# time pkg_version -vl "<" .... 21.336u 13.078s 0:32.88 104.6% 320+582k 0+0io 0pf+0w (on gmake -j2 compilation of llvm) witten ~# time pkg_version -vl "<" .... 23.275u 10.937s 3:20.62 17.0% 288+506k 186+0io 121pf+0w ie. it takes 7times takes that long to finish. can someone shed some light on this? confirm this? thnx roman --DocE+STaALJfprDB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) iEYEARECAAYFAknkwToACgkQLVEj6D3CBEyEPgCdFH/bfioLwxcxdm1Gr0bRKEqC xWAAnRShdi/avWl2QsPU5du0C2x78XVf =w36G -----END PGP SIGNATURE----- --DocE+STaALJfprDB--
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