From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Jes Sorensen <jes@sgi.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Carsten Otte <cotte@de.ibm.com>,
"Luck, Tony" <tony.luck@intel.com>,
linux-ia64@vger.kernel.org, kvm-ia64-devel@lists.sourceforge.net,
kvm-devel@lists.sourceforge.net,
virtualization@lists.linux-foundation.org, "Xu,
Anthony" <anthony.xu@intel.com>,
"Zhang, Xiantao" <xiantao.zhang@intel.com>
Subject: Re: [02/17][PATCH] Implement smp_call_function_mask for ia64 - V8
Date: Tue, 01 Apr 2008 16:06:03 +0000 [thread overview]
Message-ID: <47F25D6B.40704@goop.org> (raw)
In-Reply-To: <47F1F3B1.7020308@sgi.com>
Jes Sorensen wrote:
> Jeremy Fitzhardinge wrote:
>
>> Jes Sorensen wrote:
>> This change has been on the x86 side for ages, and not even Ingo made a
>> peep about it ;)
>>
>
> Mmmm, last time I looked, x86 didn't scale to any interesting number
> of CPUs :-)
>
Well, I guess you need all those CPUs if scanning a 64-word bitvector
takes anything like the time it takes to do an IPI...
> I wasn't suggesting we shouldn't have both interfaces, merely
> questioning why adding what to me seems like an unnecessary performance
> hit for the classic case of the call.
I don't mind how many interfaces there are, so long as there only needs
to be one place to hook to plug in the Xen version of
smp_call_function_whatever. Perhaps the answer is to just hook the IPI
mechanism itself rather than the whole of smp_call_function_mask...
Have you looked at Jens Axboe's patches to make all this stuff a lot
more arch-common?
J
WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Jes Sorensen <jes@sgi.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Carsten Otte <cotte@de.ibm.com>,
"Luck, Tony" <tony.luck@intel.com>,
linux-ia64@vger.kernel.org, kvm-ia64-devel@lists.sourceforge.net,
kvm-devel@lists.sourceforge.net,
virtualization@lists.linux-foundation.org, "Xu,
Anthony" <anthony.xu@intel.com>,
"Zhang, Xiantao" <xiantao.zhang@intel.com>
Subject: Re: [02/17][PATCH] Implement smp_call_function_mask for ia64 - V8
Date: Tue, 01 Apr 2008 09:06:03 -0700 [thread overview]
Message-ID: <47F25D6B.40704@goop.org> (raw)
In-Reply-To: <47F1F3B1.7020308@sgi.com>
Jes Sorensen wrote:
> Jeremy Fitzhardinge wrote:
>
>> Jes Sorensen wrote:
>> This change has been on the x86 side for ages, and not even Ingo made a
>> peep about it ;)
>>
>
> Mmmm, last time I looked, x86 didn't scale to any interesting number
> of CPUs :-)
>
Well, I guess you need all those CPUs if scanning a 64-word bitvector
takes anything like the time it takes to do an IPI...
> I wasn't suggesting we shouldn't have both interfaces, merely
> questioning why adding what to me seems like an unnecessary performance
> hit for the classic case of the call.
I don't mind how many interfaces there are, so long as there only needs
to be one place to hook to plug in the Xen version of
smp_call_function_whatever. Perhaps the answer is to just hook the IPI
mechanism itself rather than the whole of smp_call_function_mask...
Have you looked at Jens Axboe's patches to make all this stuff a lot
more arch-common?
J
next prev parent reply other threads:[~2008-04-01 16:06 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-28 9:59 [02/17][PATCH] Implement smp_call_function_mask for ia64 Zhang, Xiantao
2008-03-30 11:42 ` [kvm-ia64-devel] [02/17][PATCH] Implement smp_call_function_mask Avi Kivity
2008-03-30 11:42 ` [kvm-ia64-devel] [02/17][PATCH] Implement smp_call_function_mask for ia64 Avi Kivity
2008-03-31 1:40 ` Zhang, Xiantao
2008-03-31 1:40 ` Zhang, Xiantao
2008-03-30 11:42 ` Avi Kivity
2008-03-31 8:25 ` [02/17][PATCH] Implement smp_call_function_mask for ia64 - V8 Zhang, Xiantao
2008-03-31 9:12 ` Jes Sorensen
2008-03-31 9:12 ` Jes Sorensen
2008-03-31 9:12 ` Jes Sorensen
2008-03-31 10:17 ` [kvm-devel] [02/17][PATCH] Implement smp_call_function_mask foria64 " Zhang, Xiantao
2008-03-31 10:17 ` Zhang, Xiantao
2008-03-31 15:02 ` [02/17][PATCH] Implement smp_call_function_mask for ia64 " Jeremy Fitzhardinge
2008-03-31 15:02 ` Jeremy Fitzhardinge
2008-03-31 15:02 ` Jeremy Fitzhardinge
2008-04-01 8:34 ` Jes Sorensen
2008-04-01 8:34 ` Jes Sorensen
2008-04-01 8:34 ` Jes Sorensen
2008-04-01 16:06 ` Jeremy Fitzhardinge
2008-04-01 16:06 ` Jeremy Fitzhardinge [this message]
2008-04-01 16:06 ` Jeremy Fitzhardinge
2008-04-02 7:30 ` Jes Sorensen
2008-04-02 7:30 ` Jes Sorensen
2008-04-02 23:48 ` Luck, Tony
2008-04-02 23:48 ` Luck, Tony
2008-04-02 23:48 ` Luck, Tony
2008-04-02 7:30 ` Jes Sorensen
-- strict thread matches above, loose matches on Subject: below --
2008-03-31 8:25 Zhang, Xiantao
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