Date: 2 May 2002 12:45:24 -0000 From: atk2@arctic.org To: freebsd-stable@FreeBSD.ORG Subject: dd of=/dev/eide_drive bs=8192 if=/dev/mem kills system Message-ID: <20020502124524.16412.qmail@twinlark.arctic.org>
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I have 4.5-stable (updated it last night to get the ata 133 support for my disk drive). I was doing a bit of crude benchmark and used dd if=/dev/eide_drive bs=8192 of=/dev/null to test read speed (iostat -c 100 indicates about 40MB/sec sustained (i.e., not cache) - if it is accurate) Anyways I then tried to test write speed with dd of=/dev/eide_drive bs=8192 if=/dev/mem and the system hanged. I forget the exact symbols for eide_drive but it was an unmounted slice - yea I know if it worked it would have killed the slice - but the slice is unused so I didn't care). I'm not overly concern that the above killed the system as it isn't needed for daily use -- just noting it in case it is a kernel bug... (not kernel didn't panic - it hanged - I waited about 5 minutes then did a reset -- nothing responded during that time including mouse (was running X) and hdd light on case was off) Alan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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