From owner-freebsd-current Fri May 23 11:51:16 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id LAA07908 for current-outgoing; Fri, 23 May 1997 11:51:16 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id LAA07888 for ; Fri, 23 May 1997 11:51:09 -0700 (PDT) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id UAA24305 for current@FreeBSD.ORG; Fri, 23 May 1997 20:51:04 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.8.5/8.8.5) id UAA05190; Fri, 23 May 1997 20:47:08 +0200 (MET DST) Message-ID: <19970523204708.YT49812@uriah.heep.sax.de> Date: Fri, 23 May 1997 20:47:08 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: current@FreeBSD.ORG Subject: Re: cd9660 filesystem slowed down ??? References: <199705231314.XAA27893@godzilla.zeta.org.au> X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199705231314.XAA27893@godzilla.zeta.org.au>; from Bruce Evans on May 23, 1997 23:14:52 +1000 Sender: owner-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk As Bruce Evans wrote: > The second dd uses the too-small block size of 512. Apparently > read-ahead doesn't work for too-small block sizes in -current. > I get 50K/sec for a block size of 512 and almost 1200K/sec for > a block size of 2K. Indeed: j@uriah 146% dd if=/cdrom/yyyy of=/dev/null bs=2k 1392+1 records in 1392+1 records out 2850915 bytes transferred in 8.732749 secs (326462 bytes/sec) (No, this was a different file than in the other example.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)