Date: Sun, 27 Aug 2006 16:37:29 -0700 From: "Jin Guojun [VFFS]" <j_guojun@lbl.gov> To: freebsd-performance@freebsd.org Cc: hardware@freebsd.org Subject: reduce interrupt rate for CD/DVD drive(r) Message-ID: <44F22CB9.9040100@lbl.gov>
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I have difficulty to get CD/DVD write speed above 1.6MB/s (10x for CD, or 1.1x for DVD). The problem seems to be the interrupt rate is high (70-80% of CPU) for CD/DVD drive(r). I have tried three different CD/DVD drives under three different hardware platform with FreeBSD 4.11-R/6.1-R via growisofs, cdrecord, and burncd programs, and all combinations had the similar results. Non of them can go beyond the 1.6 MB/s writing speed. The reading speed is also far away from the manufactory specification due to high interrupt rate. Is any way to reduce the interrupt rate in order to increase the CD/DVD I/O performance? or is anything else to tune the performance? I doubt this is the hardware issue, but if this is possible, please point it out. Thanks, -Jin P.S.: Below is the information for systems have been tested -- Systems (FreeBSD4.11/6.1 i386): AMD XP 2100+ (1.667GHz) Intel P4 3.0GHz plus one of these CD/DVD drives: Micro Advantage CD-RW IDE-52-32 (52x read, 32x write on CD-RW media) Sony DRX-510UL CD/DVD-RW USB/1394 (2.4x DVD+RW, 4x high-speed DVD+RW) (FreeBSD-6.1 i386/amd64) AMD Turion 64 ML-34 (1.8GHz) + HP double layer 8x DVD+-R/RW Super Multi drive CD/DVD media: 48x CD-R, 52x CD-R (from manufactory), 12x high-speed CD-RW, 2x DVD-R, 4x DVD+RW
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