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From: Vivek Goyal <vgoyal@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>,
	HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
	akpm@linux-foundation.org, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org, jingbai.ma@hp.com
Subject: Re: [PATCH 0/2] x86, apic: Disable BSP if boot cpu is AP
Date: Fri, 30 Aug 2013 08:48:54 -0400	[thread overview]
Message-ID: <20130830124854.GA18156@redhat.com> (raw)
In-Reply-To: <8738ps131z.fsf@xmission.com>

On Thu, Aug 29, 2013 at 04:37:44PM -0700, Eric W. Biederman wrote:

[..]
> This situation is people who run machines of unreasonable size really
> would like to use multiple cpus when generating crash dumps.

Yes. Now kdump is in a phase where people are doing scalability work. And
one of the problems is that on mutli tera byte machines, filtering is
taking long time. With-in filtering it is especially the compression which
takes the longest (hatayama and cliff wickman have done some study here).

So Idea seems to be that bring up more cpus in the second kernel and try
to parallelize compression work and try to save dump time of multi tera
byte machines.

Thanks
Vivek

WARNING: multiple messages have this Message-ID (diff)
From: Vivek Goyal <vgoyal@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
	akpm@linux-foundation.org, "H. Peter Anvin" <hpa@linux.intel.com>,
	jingbai.ma@hp.com
Subject: Re: [PATCH 0/2] x86, apic: Disable BSP if boot cpu is AP
Date: Fri, 30 Aug 2013 08:48:54 -0400	[thread overview]
Message-ID: <20130830124854.GA18156@redhat.com> (raw)
In-Reply-To: <8738ps131z.fsf@xmission.com>

On Thu, Aug 29, 2013 at 04:37:44PM -0700, Eric W. Biederman wrote:

[..]
> This situation is people who run machines of unreasonable size really
> would like to use multiple cpus when generating crash dumps.

Yes. Now kdump is in a phase where people are doing scalability work. And
one of the problems is that on mutli tera byte machines, filtering is
taking long time. With-in filtering it is especially the compression which
takes the longest (hatayama and cliff wickman have done some study here).

So Idea seems to be that bring up more cpus in the second kernel and try
to parallelize compression work and try to save dump time of multi tera
byte machines.

Thanks
Vivek

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kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  reply	other threads:[~2013-08-30 12:49 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-29  9:27 [PATCH 0/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2013-08-29  9:27 ` HATAYAMA Daisuke
2013-08-29  9:27 ` [PATCH 1/2] x86, apic: Add boot_cpu_is_bsp() to check if boot cpu is BSP HATAYAMA Daisuke
2013-08-29  9:27   ` HATAYAMA Daisuke
2013-10-09 23:15   ` [tip:x86/bsp-hotplug] " tip-bot for HATAYAMA Daisuke
2013-08-29  9:28 ` [PATCH 2/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2013-08-29  9:28   ` HATAYAMA Daisuke
2013-08-31  5:22   ` Borislav Petkov
2013-08-31  5:22     ` Borislav Petkov
2013-09-02  2:32     ` HATAYAMA Daisuke
2013-09-02  2:32       ` HATAYAMA Daisuke
2013-09-02  7:13       ` Borislav Petkov
2013-09-02  7:13         ` Borislav Petkov
2013-09-02  9:42         ` HATAYAMA Daisuke
2013-09-02  9:42           ` HATAYAMA Daisuke
2013-09-04  6:12           ` Borislav Petkov
2013-09-04  6:12             ` Borislav Petkov
2013-09-09  6:18             ` HATAYAMA Daisuke
2013-09-09  6:18               ` HATAYAMA Daisuke
2013-10-09 23:16   ` [tip:x86/bsp-hotplug] " tip-bot for HATAYAMA Daisuke
2013-10-12 17:31     ` H. Peter Anvin
2013-10-12 17:42       ` Ingo Molnar
2013-11-11 19:54         ` H. Peter Anvin
2013-11-12 10:20           ` HATAYAMA Daisuke
2013-11-12 15:35             ` H. Peter Anvin
2013-08-29 13:54 ` [PATCH 0/2] " H. Peter Anvin
2013-08-29 13:54   ` H. Peter Anvin
2013-08-29 23:37   ` Eric W. Biederman
2013-08-29 23:37     ` Eric W. Biederman
2013-08-30 12:48     ` Vivek Goyal [this message]
2013-08-30 12:48       ` Vivek Goyal
2013-08-29 23:51   ` HATAYAMA Daisuke
2013-08-29 23:51     ` HATAYAMA Daisuke
2013-08-30 15:43     ` H. Peter Anvin
2013-08-30 15:43       ` H. Peter Anvin
2013-10-09 20:20       ` Vivek Goyal
2013-10-09 20:20         ` Vivek Goyal
2013-10-14  9:03         ` Petr Tesarik
2013-10-14  9:03           ` Petr Tesarik

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