Okay, I went ahead and installed the mainline kernel from the following
location:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.7-raring/
I rebooted and now I am running the following kernel version:
acjohnson@Satellite-L840:~$ uname -a
Linux Satellite-L840 3.7.0-030700-generic #201212102335 SMP Tue Dec 11 04:47:31
UTC 2012 i686 i686 i686 GNU/Linux
I would say the bug still exists upstream:
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 4.41778 s, 19.0 MB/s
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 3.32685 s, 25.2 MB/s
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 2.52144 s, 33.3 MB/s
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 3.13614 s, 26.7 MB/s
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 3.06433 s, 27.4 MB/s
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 2.42921 s, 34.5 MB/s
acjohnson@Satellite-L840:~$ dd if=/dev/zero of=/tmp/output bs=8k count=10k; rm
-f /tmp/output
10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 2.74525 s, 30.6 MB/s
q
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1090715
Title:
slow and sporadic hard drive write performance on ivy bridge (Toshiba
L840 Core i7-3612QM)
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