Thread: q: PC USB mode faster than acess via N900 xterm?
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bozoid is offline bozoid
2013-02-13 , 03:04
Posts: 95 | Thanked: 66 times | Joined on Mar 2012
#5
Originally Posted by reinob View Post
Well, I assume your computer is way faster than the N900, so copying/caching/etc. will be (much) faster when using the PC.

After all, there's no reason why the N900 should be faster, just because the (embedded) MMC is inserted in the N900.
Yes thanks. You're likely correct.
I suspect the same as well but thought no harm asking in case someone has a different answer.

Thing is, usually IO is the slowest part of such operation & can be 80-90 pcnt the reason for the latency.
eMMC is accessed directly by N900 while via PC, there is the USB "bottleneck"... data might need to go all the way up into PC CPU/mem buffers and all the way back down into N900. Unless there is some mechanism in N900 eMMC which takes away the need for that to happen (, where data frm eMMC goes into an N900 local buffer and then go back onto eMMC for writes, thus bypassing USB and PC altogether). But if such a mechanism exists, wldnt it be used within the kernel in N900? (would mean that N900 eMMC IO could be much faster!). Hmmm. Curious curious...

kh