On Thu, May 26, 2011 at 06:40:43PM -0700, YongHyeon PYUN wrote: > Hi, > > Here is a patch that implements 64bit DMA on msk(4). If you use > msk(4) on a system that has more than 4GB memory, please try the > patch at the following URL and let me know whether it works or not. > You need latest msk(4) in HEAD to apply the patch. > http://people.freebsd.org/~yongari/msk/msk.64bit.dma.diff > > Previously msk(4) may have used bounce buffers on systems that have > more than 4GB memory. You can verify whether msk(4) is using bounce > buffers by checking the output of "sysctl hw.busdma". For instance, > hw.busdma.zone0.total_bounced counter would increase while network > operation is in progress. If patch above works you wouldn't see > the counter change anymore and it would also enhance network > performance since it wouldn't have to copy from or to bounce > buffers. > Committed to HEAD(r227582). > Thanks.Received on Wed Nov 16 2011 - 18:26:24 UTC
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