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| author | Alan Stern <stern@rowland.harvard.edu> | 2013-05-14 13:57:19 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-06-07 12:52:22 -0700 |
| commit | 33edcea352d7c7e601a61e987b029620fed0ca4d (patch) | |
| tree | b4aa0c0afd0601f645f86f74701fb290b0b1d56d /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | aa4ccf7a840cadad4d835869ea96d24ecca42c40 (diff) | |
USB: fix latency in uhci-hcd and ohci-hcd
commit e1944017839d7dfbf7329fac4bdec8b4050edf5e upstream.
Commits c44b225077bb1fb25ed5cd5c4f226897b91bedd4 (UHCI: implement new
semantics for URB_ISO_ASAP) and
6a41b4d3fe8cd4cc95181516fc6fba7b1747a27c (OHCI: implement new
semantics for URB_ISO_ASAP) increased the latency for isochronous URBs
in uhci-hcd and ohci-hcd respectively to 2 milliseconds, in an
attempt to avoid underruns. It turns out that not only was this
unnecessary -- 1-ms latency works okay -- it also causes problems with
certain application loads such as real-time audio.
This patch changes the latency for both drivers back to 1 ms.
This should be applied to -stable kernels going back to 3.8.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: Joe Rayhawk <jrayhawk@fairlystable.org>
CC: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions