Date: Mon, 13 Mar 2006 18:04:18 GMT From: Dieter <freebsd@sopwith.solgatos.com> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/94415: systat(1) reports incorrect data for CD/DVD drive Message-ID: <200603131804.k2DI4IxO019137@www.freebsd.org> Resent-Message-ID: <200603131811.k2DIB6uV090772@freefall.freebsd.org>
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>Number: 94415 >Category: bin >Synopsis: systat(1) reports incorrect data for CD/DVD drive >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Mar 13 18:11:05 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Dieter >Release: 6.0 >Organization: >Environment: 6.0-RELEASE amd64 >Description: Kernel is GENERIC with addition of: device atapicam # needed to burn dvd AMD64 nforce4-ultra PATA CD/DVD drive acd0: DVDR <HL-DT-ST DVDRAM GSA-4160B/A301> at ata0-master UDMA66 cd0 at ata0 bus 0 target 0 lun 0 cd0: <HL-DT-ST DVDRAM GSA-4160B A301> Removable CD-ROM SCSI-0 device cd0: 66.000MB/s transfers cd0: cd present [2295104 x 2048 byte records] "systat -vmstat" reports MB/s for cd0 that is 2x the actual rate. >How-To-Repeat: This is with UFS/FFS on a DVD+RW, but I doubt the bug depends on that. Run "systat -vmstat" and generate some IO on the dvd drive. Example 1: cmp /foo/bigfile /dvd/bigfile systat will report that cd0 has twice the MB/s of the hard drive. Example 2: dd if=/dvd/bigfile of=/dev/null bs=1m systat will report twice the MB/s that dd does. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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