We have 2 products which can perform better with increased Bulk transfers
Device No. 1:
According to the hardware spec of on of our product
Available Bulk Transfer Size are:
- 188 * n bytes, where n = 1 ~ 256.
Although we can drive that one with 15K as well when setting the HW
register down to it.
Device No. 2
only creates jitter video with Bulk transfer sizes which are below
24064 bytes, no such chipfeature is available
to decrease the bulk transfer size.
http://sundtek.de/images/dtvjitter2.jpg
with transfer size of 24064:
http://sundtek.de/images/gooddata.jpg
The patch takes the features of Device No. 1 into account allowing a
maximum buffer of 48128 bytes.
Those issues have been evaluated with MacOSX and a customized patched
Linux version.
Device No. 2 also corrupts on MacOSX with too small packet sizes,
Windows and Mac are using 24064 bytes.
Default Bulk Transfersize of device No. 1 is around 1-2k which leads
to very high cpu usage, updating it to 15k lowers that one.