Date: Fri, 8 Mar 1996 23:52:22 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hackers@freebsd.org Subject: IDE performance Message-ID: <199603082252.XAA13934@labinfo.iet.unipi.it>
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Can someone tell me why my IDE disk (WDC AC31600, 1.6GB) mounted on the primary IDE (together with a slave ATAPI CDROM) runs at 5.5MB/s (both with iozone 128 8192 and with bonnie, block transfer), and the same disk on the secondary IDE does "just" little more than 3.1MB/s ? This is on a Pentium100, Intel Zappa MB with built-in IDE controller, 32MB ram, 2.1R. The wdc driver is compiled with flags 0x80ff80ff on both primary and secondary interfaces. Is this a feature of the motherboard, or something in the kernel ? (or just because IDE sucks... :) BTW, I'd like to try the ccd driver on multiple IDE disks [at 5.5MB each, I am really curious how they scale up!]. Any idea if I can boot/swap on a ccd "unit" ? And, in this case, any idea on how can I install the system on a ccd "unit" ? Alternatively, I can boot a diskless kernel but at leas having local swap would be nice. Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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