This bug was fixed in the package linux-ti-omap4 - 2.6.38-1209.16
---------------
linux-ti-omap4 (2.6.38-1209.16) natty-proposed; urgency=low
* Release tracking bug
- LP: #862554
[ Ming Lei ]
* SAUCE: usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
- LP: #709245
[ Upstream Kernel Changes ]
* cifs: fix possible memory corruption in CIFSFindNext, CVE-2011-3191
- LP: #834135
- CVE-2011-3191
* befs: Validate length of long symbolic links, CVE-2011-2928
- LP: #834124
- CVE-2011-2928
* gro: Only reset frag0 when skb can be pulled, CVE-2011-2723
- LP: #844371
- CVE-2011-2723
* Validate size of EFI GUID partition entries, CVE-2011-1776
- LP: #844365
- CVE-2011-1776
* inet_diag: fix inet_diag_bc_audit(), CVE-2011-2213
- LP: #838421
- CVE-2011-2213
* si4713-i2c: avoid potential buffer overflow on si4713, CVE-2011-2700
- LP: #844370
- CVE-2011-2700
* Bluetooth: Prevent buffer overflow in l2cap config request,
CVE-2011-2497
- LP: #838423
- CVE-2011-2497
* crypto: Move md5_transform to lib/md5.c, CVE-2011-3188
- LP: #834129
- CVE-2011-3188
* net: Compute protocol sequence numbers and fragment IDs using MD5,
CVE-2011-3188
- LP: #834129
- CVE-2011-3188
* ext4: Fix max file size and logical block counting of extent format
file, CVE-2011-2695
- LP: #819574
- CVE-2011-2695
-- Paolo Pisati <paolo.pis...@canonical.com> Fri, 30 Sep 2011 12:12:00 +0200
** Changed in: linux-ti-omap4 (Ubuntu Natty)
Status: Fix Committed => Fix Released
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2011-2695
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https://bugs.launchpad.net/bugs/709245
Title:
ARM SMP scheduler performance bug
Status in Linaro Ubuntu Evaluation Builds:
Fix Released
Status in Linaro Linux:
Fix Committed
Status in OEM Priority Project:
Fix Committed
Status in OEM Priority Project maverick series:
Fix Committed
Status in OEM Priority Project natty series:
Fix Committed
Status in OEM Priority Project oneiric series:
Fix Released
Status in “linux-ti-omap4” package in Ubuntu:
Fix Released
Status in “linux-ti-omap4” source package in Maverick:
Fix Released
Status in “linux-ti-omap4” source package in Natty:
Fix Released
Status in “linux-ti-omap4” source package in Oneiric:
Fix Released
Bug description:
Original Bug name: "panda: USB disk IO slow"
This bug effects ARM Cortex A9 cores, snowball, nvidia, OMAP 4, and
other Cortex A9 processors. Problem is in Fedora ARM builds also so
not limited to Ubuntu.
My Panda's USB seems to be significantly slower than a Beagle C4.
hdparm shows buffered reads as ~12MB/s on the Panda, and about ~20-25MB/s on
a Beagle C4 from the same
external Lacie USB disk.
Kernel is 2.6.37-1002-linaro-omap
Disk shows as:
[ 5.170440] scsi 0:0:0:0: Direct-Access LaCie d2 quadra
PQ: 0 ANSI: 4
[ 5.172546] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 5.175415] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks: (500
GB/465 GiB)
The board is otherwise idle during the test.
Doing perf_2.6.37-12 record -a dd if=/dev/sda of=/dev/null bs=4096
count=100000
shows :
81.41% swapper [kernel.kallsyms] [k] default_idle
6.33% dd [kernel.kallsyms] [k] __copy_to_user
0.94% swapper [kernel.kallsyms] [k] cpu_idle
0.51% dd [kernel.kallsyms] [k] __make_request
0.51% perf_2.6.37-12 [kernel.kallsyms] [k] __copy_from_user
which suggests it's not CPU constrained.
Dave
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