Date: Sat, 5 May 2007 15:19:34 -0700 From: Paul Allen <nospam@ugcs.caltech.edu> To: freebsd-stable@freebsd.org Subject: cbb/ata induces high interrupt load Message-ID: <20070505221934.GB10235@hurl.ugcs.caltech.edu>
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While performing a sequential read from a compact flash disk over cardbus (cbb), I observe the following: iostat reports transfer rate of 0.72MB/s with average transaction size of 32K top -S reports 80% interrupt time. 78% of which is attributed to irq11 vmstat -i reports about an order of magnitude more interrupt load on irq11. dmesg | grep 'irq 11' shows: cbb0: <TI1450 PCI-CardBus Bridge> mem 0x50000000-0x50000fff irq 11 at device 2.0 on pci0 cbb1: <TI1450 PCI-CardBus Bridge> mem 0x50100000-0x50100fff irq 11 at device 2.1 on pci0 ata2: <SAMSUNG 04/05/06> at port 0x100-0x10f irq 11 function 0 config 1 on pccard1 Any suggestions?
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