linux.gentoo.user

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Hi,

I had problems with CFS too. Similar to the one's you describe. Under
heavy disk/cpu-load (like emerge and updatedb in parallel) the system
was unresponsive. I changed the scheduler back to anticipatory and the
problem was gone.
Interestingly i also have a thinkpad, X30 in my case.

best
Thomas

fire-eyes wrote:
| Andrey Falko wrote:
|> On Thu, Mar 6, 2008 at 10:38 PM, fire-eyes wrote:
|>> Hello,
|>>
|>> I'm running gentoo on an IBM Thinkpad T43. In the past, disk access was
|>> fine under load (CPU or disk). These days, the disk becomes painfully
|>> slow under moderate to high CPU usage (such as compiling) or copying
|>> more than a few MB. GUI's become almost totally unresponsive and at
|>> times I have to down the system hard.
|>>
|>> So it seems it's some sort of a change in kernels compared to the past.
|>> I have always run a vanilla kernel, manually configured and installed.
|>> Right now I am running 2.6.24.3.
|>>
|>> The system uses an SATA disk drive.
|>>
|>> Here is the boot line in grub.conf:
|>> kernel /boot/vmlinuz-stable root=/dev/sda4 rw hdc=noprobe
|>> acpi_sleep=s3_bios panic=5 elevator=cfq nmi_watchdog=0
|>>
|>> /boot/vmlinuz-stable being a symlink to the kernel I consider "stable"
|>> within /boot/. I also have vmlinuz-last called by another grub entry if
|>> I need it.
|>>
|>> Here is my kernel config: http://fire-eyes.org/t/config-2.6.24.3.txt
|>> (may disappear in the future)
|>>
|>> I am looking for feedback into what may be causing this mess. It makes
|>> for a very frustrating time using this laptop.
|>>
|> What is the version of the kernel where you did not have issues?
|> 2.6.24 and 23 have a new CPU scheduler (CFS), which "should" work
|> better than the old one. It is possible that the new scheduler does
|> not suit your needs.
|
| Thanks for the reply.
|
| I do not recall, other than it was four or more months ago. Do you
| happen to know what version of the kernel that scheduler showed up in?
| Also, is that scheduler not irrelevant here as I was passing elevator=cfq?
|
| By the way, I did a little experimentation. I changed my scheduler to
| deadline, and set preemption to desktop. Before the scheduler was cfq,
| and the preemption to low-latency desktop.
|
| Things already feel snappier gui-wise, but I have yet to push the
| disk/cpu to see what will happen. I believe it is at least the start of
| improvements, however.

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