Date: Wed, 15 Sep 2004 11:19:32 GMT From: Björn König <bkoenig@cs.tu-berlin.de> To: freebsd-gnats-submit@FreeBSD.org Subject: i386/71761: disk write operations too slow (probably DMA problems with ICH2) Message-ID: <200409151119.i8FBJWZZ007354@www.freebsd.org> Resent-Message-ID: <200409151120.i8FBKLXh011534@freefall.freebsd.org>
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>Number: 71761
>Category: i386
>Synopsis: disk write operations too slow (probably DMA problems with ICH2)
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-i386
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Sep 15 11:20:20 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Björn König
>Release: FreeBSD 5.3-BETA4
>Organization:
>Environment:
FreeBSD alpha.local 5.3-BETA4 FreeBSD 5.3-BETA4 #0: Mon Sep 13 15:39:18 UTC 2004 bkoenig@hoppel.local:/usr/obj/usr/src/sys/GENERIC i386
>Description:
Disk write speed since 5.3 ist too low.
37 MB/s are expected (5.2.1). I get around 13 MB/s
with 5.3-BETA. atacontrol shows already UDMA100, but if
I set UDMA100 explicitly again, then I get 25 MB/s;
it's still too slow.
It's not a hardware failure, because with 5.2.1
it still works perfectly. Mainboard is an Asus
TUSL2-C (i815EP) with ICH2 controller.
>How-To-Repeat:
dd if=/dev/zero of=<filename> bs=4096 count=262144
writes 1G of data and shows the average throughput.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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