DMA in B2Test board?

[Bipin Gautam]

hello,
I experimented with various block size for file I/O. I experimented
with vfat and ext2 filesystem in the pen drive. i also experimented
with file write within nand storage; like

date
dd if=/dev/zero of=/testfile bs=6144 count=102400
date

The maximum preformance of XO nand storage (alone) was ~1.8 mb/sec
(jffs2) while the preformance of external usb drive is ~ 3-11 mb /sec
(at various block size)

i thought 100% cpu use is because direct memory access(DMA) for disk
I/O has some problems (or disabled). Also, running  XO OS[1] in
virtual machine inside Parallels Workstation 2.2 with host OS xp sp2
shows the same problem of 100% cpu use during disk i/o


i cant give you a detailed stats. right now as my B2 OS is dead and
i'm downloading the latest build. (maybe tomorrow... if you want to
hear it)

with regards,
-bipin
[1]olpc-redhat-stream-development-build-239-20070118_1416-devel_ext