Hi, > > Note that you miss the OS here. Usually, when using DMA the process > blocks and later an interrupt wakes it up. Sleep and wakeup carry > overhead that may be bigger than the gains of making the CPU available. > Yes, but the speed of the CPU now and ever has been much greater than that of the devices and interconnect. And therefore the overhead of the CPU would not be that great as that with devices. Also, during this time while device is working on the request, CPU can be utilized. > with read/write instructions (i.e. in/out or ld/st) can have the > drawback that they may requre address phase with certain busses and > bridges, i.e. no burst. Bus master devices usually perform burst > transfers, thus the gain is twofold: a) faster transfers b) available > CPU. > I m in sync with it. Thanks for putting it more explicitly than I did. Thanks, Sumit > ~velco > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/
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