Date: Fri, 1 Aug 2008 15:59:30 -0700 From: "Patrick C" <pcloches@gmail.com> To: "Wojciech Puchar" <wojtek@wojtek.tensor.gdynia.pl> Cc: Free BSD Questions list <freebsd-questions@freebsd.org> Subject: Re: Troubleshooting a 3Ware 9550SX under 6.3 Message-ID: <34394a3a0808011559u764842fdv4aad492d61d73faf@mail.gmail.com> In-Reply-To: <20080610001335.E50875@wojtek.tensor.gdynia.pl> References: <484D9C13.9090607@baylessfamily.org> <20080610001335.E50875@wojtek.tensor.gdynia.pl>
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This is a very important point. By turning the cache on, you have not resolved an underlying performance issue, if there even is one. Please try dd again with a well-sized bs= parameter, or use some more accurate reporting like iozone, sysbench, etc. Also, I am not sure how much memory is on the card, but that is likely COMPLETELY in cache at that point so you're not learning anything. Write a couple gigs to get some real numbers. -Patrick 2008/6/9 Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>: >> dd if=/dev/zero of=testfile >> 165760+0 records in >> 165759+0 records out >> 84868608 bytes transferred in 25.028232 secs (3390915 bytes/sec) > >> I think I ought to be able to get more than 3.2MB/sec out of this card, > > with default 512 bytes blocks - not much more > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >
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