** Changed in: linux
Importance: Unknown = Medium
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https://bugs.launchpad.net/bugs/129172
Title:
kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine.
kernel
Thanks Richard.
I'm going to go ahead and tentatively mark this Fix Released for
Intrepid. If you see any regressions with this bug prior to Intrepid's
final release please feel free to reopen by setting the status back to
New. Thanks.
** Changed in: linux (Ubuntu)
Status: Incomplete =
Thanks for your message. I've just had a chance to try it on Alpha 6. The bug
is gone, as far as I can tell. At any rate, repeating the original test (for
((i=0;i1;i++)); do echo $i /dev/null ;done), completes in about 1/2
second, which is now perfectly OK.
Thanks for your help - Richard
The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the
upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would
appreciate it if you could please test this newer 2.6.27 Ubuntu kernel.
There are one of two ways you should be able to test:
1) If you are comfortable
I am assigning this bug to the 'ubuntu-kernel-team' per their bug
policy. For future reference you can learn more about their bug policy
at https://wiki.ubuntu.com/KernelTeamBugPolicies .
** Changed in: linux-source-2.6.22 (Ubuntu)
Assignee: (unassigned) = Ubuntu Kernel Team
Flashing the BIOS has helped (luckily Gigabyte provide a DOS flashing
utility) and now booting with 8GB system memory installed, and no mem=
parameters, makes the system behave correctly. So I would consider that
bug not a kernel bug, but a hardware issue indeed.
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kernel performance is *very*
The same happens on slightly different motherboard (Gigabyte
GA-G33-DS3R), with the same processor (Q6600) and 8GB RAM. When running
on 4GB it works fine. With 8GB it's terribly slow.
Similar behaviour can be observed when trying to run the Knoppix Live
CD (32-bit, 4.0). With 8GB it doesn't boot
I tried with the mem value (mem=8318M) and it was slow, so tried with
(mem=7168M) and it booted quickly. But that hasn't solved the problem. Once
I've started JBOSS on that server, the JBOSS was starting very slowly. So my
gut feeling is that without the mem parameter the kernel puts itself
While this is arguably a BIOS bug, Linux's failure to support PAT is the
key failure here. Even then, we could handle this much better than we
currently do by clipping memory size to the level covered by the MTRRs.
** Changed in: linux-source-2.6.22 (Ubuntu)
Status: Invalid = Confirmed
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** Changed in: linux-source-2.6.22 (Ubuntu)
Status: Confirmed = Invalid
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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug notification because you are a member of Ubuntu
Bugs, which
** Changed in: linux (upstream)
Status: Unknown = Invalid
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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug
Does the Knoppix CD enable all 8Gb of RAM? I would suspect not. In any
case, getting the output of /proc/mtrr from the Knoppix Live CD might
tell us why it works.
Yes. filing it upstream if the best thing to do in such cases.
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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is
Confirm the existence of the bug and adding upstream dependency.
** Changed in: linux-source-2.6.22 (Ubuntu)
Importance: Undecided = Medium
Assignee: Chuck Short = (unassigned)
Status: New = Confirmed
** Also affects: linux (upstream) via
Thanks, Amit.
Here's /proc/mtrr:
reg00: base=0x1 (4096MB), size= 512MB: write-back, count=1
reg01: base=0x1 (4096MB), size=4096MB: write-back, count=1
reg02: base=0x ( 0MB), size=4096MB: write-back, count=1
reg03: base=0xe000 (3584MB), size= 512MB: uncachable,
Richard, could you post the contents of /proc/mtrr?
--
kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for
To elaborate, this might be a bios bug similar to #132577.
--
kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact
Already tried that. I've moved things around such that I've tested every DIMM
and every slot.
Also, if I remove one DIMM (from any slot), leaving 6GB present, everything
works fine.
The DIMMs are a matched set of 4 x 2GB Geil Black Dragon, PC6400. Everything
passes memtest.
--
kernel
Could you try moving the memory modules around? e.g. moving the last one
to the first.
--
kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug notification because you are a member of Ubuntu
But it looks like more of a hardware problem according to the bugzilla
report.
** Changed in: linux-source-2.6.22 (Ubuntu)
Sourcepackagename: linux-meta = linux-source-2.6.22
Assignee: (unassigned) = Chuck Short
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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine.
When you say looks like a hardware problem, I'm not quite sure what
you mean. At first, I'd be inclined to agree with you, however it's
entirely new hardware, it passes memtest fine (for 12 hours), and
everything works perfectly, with the exception that I can't use all the
physical RAM. All the
This bug also occurs with Gentoo and Mandriva 64-bit Live-CDs. Cross-filing as
a kernel bug:
http://bugzilla.kernel.org/show_bug.cgi?id=8883
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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this
Still true with 2.6.22-9.
--
kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for Ubuntu.
--
ubuntu-bugs
Oops - I can't subtract! I meant: 8192 actual - 7621 available =
571MB wasted. So at least I can use about 93% of the installed RAM.
--
kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
https://bugs.launchpad.net/bugs/129172
You received this bug
Probably more helpful if I attach the file here.
** Attachment added: Various diagnostics: dmesg, /proc etc
http://launchpadlibrarian.net/8600264/8gbbug.tar.gz
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kernel performance is *very* slow with 8GB RAM on AMD64. 6GB is fine. kernel
2.6.22-8 x86_64
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