advocacy/73646: I/O performance: with/without MEMIO option
wkwu at csie.nctu.edu.tw
Sun Nov 7 09:40:17 PST 2004
>Synopsis: I/O performance: with/without MEMIO option
>Arrival-Date: Sun Nov 07 17:40:16 GMT 2004
>Originator: Wei-Kai Wu
>Release: FreeBSD 5.2.1-RELEASE amd64
LSI 1030 Ultra4 Adapter
We ran more than 20000 processes concurrently. Each process requests for
random disk I/O for small files. (reading/writing)
With AHA aic7892/7899 (AHC_ALLOW_MEMIO enabled), the system works well.
With AHA aic7901/7902 (use "ahd" driver), the system works bad.
The console hangs frequently. Each process hangs frequently.
With LSI 1030 (mpt driver), the system works soso.
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