Messages in this thread |  | | Subject | Re: [RFD w/info-PATCH] device arguments from lookup, partion code | Date | Mon, 21 May 2001 22:29:50 +0100 (BST) | From | Alan Cox <> |
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> Which, BTW, is a wonderful reason for having multiple channels. Instead > of write(fd, "critical_command", 8); read(fd,....); you read from the right fd. > Opened before you enter the hotspot. Less overhead than ioctl() would > have...
The ioctl is one syscall, the read/write pair are two. Im not sure that ioctl is going to be more overhead there. In the video4linux case the high overhead is acking frames received by mmap so might conceivably be considered one way
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