Date: Mon, 8 Nov 2004 01:36:37 +0800 (CST) From: Wei-Kai Wu <wkwu@csie.nctu.edu.tw> To: FreeBSD-gnats-submit@FreeBSD.org Subject: advocacy/73646: I/O performance: with/without MEMIO option Message-ID: <200411071736.iA7Hablu089473@mailgate.csie.nctu.edu.tw> Resent-Message-ID: <200411071740.iA7HeHZ4056503@freefall.freebsd.org>
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>Number: 73646 >Category: advocacy >Synopsis: I/O performance: with/without MEMIO option >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-advocacy >State: open >Quarter: >Keywords: >Date-Required: >Class: change-request >Submitter-Id: current-users >Arrival-Date: Sun Nov 07 17:40:16 GMT 2004 >Closed-Date: >Last-Modified: >Originator: Wei-Kai Wu >Release: FreeBSD 5.2.1-RELEASE amd64 >Organization: Kavalan >Environment: AHA aic7892/7899 AHA aic7901/7902 LSI 1030 Ultra4 Adapter >Description: 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. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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