Re: [PATCH] x86_32: trim memory by updating e820 v3

view
thread

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

From: Yinghai Lu

Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

Date: Tuesday, April 29, 2008 - 12:44 pm

On Tue, Apr 29, 2008 at 12:19 PM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
quoted text> "Yinghai Lu" <yhlu.kernel@gmail.com> writes:
>
>
> >>  The potential problem isn't while we reprogram the MTRRs, the potential
>  >>  problem is mapping the SMM area uncachable.  In which case we will
>  >>  make each SMM interrupt drastically slower.  Which can have all kinds of
>  >>  unpleasant side effects.
>  >
>  > and ACPI area too.
>
>  True but at least that one is visible.
>
>
>  > that only try to make the continuous to discrete layout. and still try
>  > to cover all that is (WBs - UC) directly with WB.
>  > only thing is that could run out of MTRR..., and mtrr_gran_size is
>  > used to avoid that.
>  > then some RAM that is less than mtrr_gran_size could be dumped.
>  > so mtrr_gran_size could do sth.
>  > anyway this patch only can meet one end.
>  > for example Mika Fischer's system doesn't need to trim any RAM in MTRR.
>  > but for Gabriel's system may need to trim some RAM in MTRR.
>
>  Right.  Ram trimming (changing memory from WB to UC) is the potential
>  problem.
>
>  See my other post, in short I think we can address safely address all
>  of the systems where the only problem is the selection of MTRRs by the
>  BIOS.

BIOS should provide the selection...

quoted text>
>  Then have an option (mtrr_chunk_size) for RAM trimming that is
>  off by default.

Yes. there is CONFIG option and boot command line to enable it.

YH
--
unsubscribe noticeTo unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:

[PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Sun Jan 20, 11:56 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Jesse Barnes, (Mon Jan 21, 9:30 am)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Mon Jan 21, 12:14 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Mon Jan 21, 1:09 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Mon Jan 21, 2:37 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Ingo Molnar, (Tue Jan 22, 9:51 am)

[PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Jan 22, 5:23 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Tue Jan 22, 8:50 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Fri Jan 25, 5:01 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Fri Jan 25, 5:16 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Fri Jan 25, 5:37 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Ingo Molnar, (Mon Jan 28, 8:09 am)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Mon Jan 28, 11:07 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Andrew Morton, (Sat Apr 26, 3:56 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Sat Apr 26, 5:56 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sat Apr 26, 5:57 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sat Apr 26, 6:05 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sat Apr 26, 6:22 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Sun Apr 27, 1:21 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Sun Apr 27, 1:29 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sun Apr 27, 11:44 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sun Apr 27, 11:50 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 1:38 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 2:09 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:18 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 2:34 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 2:44 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:54 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:58 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 3:03 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 3:07 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Mon Apr 28, 6:53 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 7:11 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 7:15 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 7:24 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Jesse Barnes, (Mon Apr 28, 9:09 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 9:31 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Jesse Barnes, (Mon Apr 28, 9:55 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Mon Apr 28, 11:07 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 12:03 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 12:06 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 12:08 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 12:38 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 12:46 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 1:45 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:19 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 3:03 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 3:56 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 4:16 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 4:23 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 6:05 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 7:41 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Tue Apr 29, 3:31 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Tue Apr 29, 3:34 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Tue Apr 29, 3:37 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Apr 29, 3:42 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Andrew Morton, (Tue Apr 29, 5:40 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Jesse Barnes, (Tue Apr 29, 8:52 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Tue Apr 29, 10:29 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Apr 29, 11:40 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Tue Apr 29, 12:19 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Apr 29, 12:44 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Tue Apr 29, 1:02 pm)

[patch] PCI: export resource_wc in pci sysfs, Ingo Molnar, (Tue Apr 29, 3:03 pm)

Re: [patch] PCI: export resource_wc in pci sysfs, Andrew Morton, (Tue Apr 29, 3:24 pm)

Navigation

Popular discussions


linux-kernel:
Ken Chen	[patch] sched: fix inconsistency when redistribute per-cpu tg->cfs_rq shares.
Ingo Molnar	Re: [PATCH v3] x86: merge the simple bitops and move them to bitops.h
Andi Kleen	Re: - romsignature-checksum-cleanup-2.patch removed from -mm tree
Axel Lin	[PATCH] tc6393xb: fix wrong goto labels for error handling
Matthew Wilcox	Re: 2.6.22-rc3-mm1
git:
Johannes Schindelin	Re: [PATCH 05/21] Make parse_tag_buffer_internal() handle item == NULL
Johannes Sixt	Re: [PATCH] Fix handle leak in builtin-pack-objects
Linus Torvalds	Re: [PATCH, take 1] Linear-time/space rename logic (exact renames only)
Alex Riesen	Re: [PATCH] fmt-merge-msg: avoid open "-\|" list form for Perl 5.6
Nicolas Pitre	Re: [PATCH 2/2] Implement a simple delta_base cache
git-commits-head:
Linux Kernel Mailing List	V4L/DVB (8018): Add em2860 chip ID
Linux Kernel Mailing List	PCI: fix kernel oops on bridge removal
Linux Kernel Mailing List	rtl8187: use DMA-aware buffers with usb_control_msg
Linux Kernel Mailing List	Blackfin: use KERN_ALERT in all kgdb_test output
Linux Kernel Mailing List	MIPS: Bonito64: Make Loongson independent from Bonito64 code.
linux-netdev:
Richard Cochran	Re: [PATCH v3 3/3] ptp: Added a clock that uses the eTSEC found on the MPC85xx.
David Miller	Re: [RFC] bridge: STP timer management range checking
Herbert Xu	Re: [RFC PATCH 00/17] virtual-bus
Lennert Buytenhek	Re: [PATCH 3/6] [NET] dsa: add support for original DSA tagging format
Herbert Xu	Re: [2/2] igb: Replace LRO with GRO
freebsd-current:
Boris Samorodov	Re: twa + dump = sbwait
Andrey	Re: RELENG_7 and HEAD: bge causes system hang
韓家標 Bill Hacker	Re: ZFS honesty
samira	sata atapi on ich9r
JoaoBR	Re: I like my rc.d boot messages :(

Colocation donated by:

Syndicate