Date: Tue, 06 May 2008 15:56:28 -0400 From: WKK <wkk@wkk.com> To: freebsd-hardware@freebsd.org Subject: industrial computer flash performance issues Message-ID: <4820B7EC.5040705@wkk.com>
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I have a Nagasaki IPC industrial computer that has an 8 GB flash drive on a 44 pin ATA connector. I have booted FreeBSD 6.2 and 7.0 via a USB CD drive and I am getting very bad read performance. dd if=/dev/ad0 of=/dev/null bs=128k count=100 is only showing about 4MB/s. I have also tried a CF via a PCMCIA adapter and I am also seeing about the same performance. The same CF device connected with a USB adapter (/dev/da0) gets about 16MB/s so it seems like some type of ATA driver issue. >From dmesg: atapci0: <VIA 8237 UDMA133 controller> port …. …. ad0: 7765MB <JMAU FDM 8GB 2.0> at ata0-master PIO4 atacontrol cap ad0 shows that dma and overlap is not supported and all the features are no. Does anyone have any suggestions for improving performance?home | help
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