Question about Linare Desktop, AMD Sempron 2200,40 GB HDD & 128 MB RAM
How and by what mechanism is DMA used in peripheral device drivers as well as functionalities such as network packet routing, audio playback and streaming video.
DMA - DIRECT MEMORY ACCESS
Now a days DMA is replaced with Bus Mastering technology , but still some sound chips use DMA to increase the Audio performance
DMA is a kind of technology where the data transfer is controlled by a chip other than CPU thus freeing cpu for other tasks.
When you request data from a high speed pheripheral for reading or writing , an Interrupt is generated by the pheripheral to alert the CPU , CPU then service the ISR ( Interrupt service routine) to perform the task , DMA plays its role here , it taks control from CPU for further data transfers over a bus , and act as a second cpu and monitor the data transfers.
Posted on Nov 20, 2007
IT it a little "brige" to some sound aplications or routing signal to Printers or Sound Cards, but not for Network. Not good sometimes for Sound Cards, but you can play sometimes with settings and see what happend, you always can go back the DMA at previuos state, or simple, disable.
Posted on Nov 18, 2007
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To enable DMA mode using the Device Manager
Open Device Manager.
Double-click IDE ATA/ATAPI Controllers to display the list of controllers and channels.
Right-click the icon for the channel to which the device is connected, select Properties, and then click the Advanced Settings tab.
In the Current Transfer Mode drop-down box, select DMA if Available if the current setting is "PIO Only."
If the drop-down box already shows "DMA if Available" but the current transfer mode is PIO, then the user must toggle the settings. That is:
Change the selection from "DMA if available" to PIO only, and click OK.•
Then repeat the steps above to change the selection to DMA if Available.
Oct 14, 2007 | PC Desktops
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