Date: Mon, 07 Feb 2005 09:02:58 +0300 From: Andrey Smagin <samspeed_____@mail.ru> To: freebsd-performance@freebsd.org Subject: My notices about ATA performance Message-ID: <E1Cy1z8-000Lei-00.samspeed_____-mail-ru@f9.mail.ru>
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Hi ALL. I have 2 PC. 1. iP 166 (RAM 48Mb) 2. Duron 1133 (RAM 1Gb) 2 HDD - WD and Seagate (120GB/8Mb cache). Kernels used FreeBSD 4.8 RELEASE FreeBSD 5.1 RELEASE FreeBSD 6.0 CURRENT (1-2 week old) Test speed of copying 1 large (600Mb) file from 1 HDD to another. If put HDD's on PC 1 under 4.8 - 7-10 MBytes/s (UDMA33)(60%CPU Usage) under 5.1 - 2.7-3 MBytes/s (UDMA33)(100%CPU Usage) under 6.0 - 2.7-3 MBytes/s (UDMA33)(100%CPU Usage) If put better CPU K6-2-233 on PC 1 then speed of copying increased under 5.1 - 3.2-4 MBytes/s (UDMA33)(100%CPU Usage) under 6.0 - 3.2-4 MBytes/s (UDMA33)(100%CPU Usage) If put HDD's on PC 2 under 4.8 not tested under 5.1 - 34-41 MBytes/s (UDMA100)(~30%CPU Usage) under 6.0 - 33-41 MBytes/s (UDMA100)(~30%CPU Usage) Why speed of IO operations very depend from CPU power in 5x and 6.x ?
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