Hi,
On 11/06/2015 01:23 PM, Alan Stern wrote:
On Fri, 6 Nov 2015, Bin Liu wrote:
This reverts commit 2035772010db634ec8566b658fb1cd87ec47ac77.
Commit 20357720 claims throughput improvement for MSC/UVC, but I
don't see much improvement. Following are the MSC measurement using
dd on AM335x GP EVM.
with BCD_BH: read: 14.9MB/s, write: 20.9MB/s
without BCD_BH: read: 15.2MB/s, write: 21.2MB/s
However with this commit the following regressions have been observed.
1. ASIX usb-ethernet dongle is completely broken on UDP RX.
2. Unpluging a 3G modem, which uses option driver, behind a hub causes
console log flooding with the following message.
option_instat_callback: error -71
Did you do any debugging to figure out why these problems occur with
HCD_BH but don't occur without it?
No, I never got a chance to debug it, but I am wondering if something
causes the BH does not get a chance to execute...
I should have mentioned that both cases failed in PIO mode too, so not
CPPI related.
BTY, the TI kernel prior to mainline 3.12+ does not use HCD_BH in musb
driver.
Regards,
-Bin.
Alan Stern
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