Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 07:24:27PM +, Yu, Fenghua wrote: > I haven't tested on AMD. But I think AMD should have the same code. Again, bear in mind, this is a qemu+kvm guest. > Could you please check if > /sys/device/system/cpu/cpu#/cache/index#/shared_cpu_map contains only > the cpu itself?

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 07:24:27PM +, Yu, Fenghua wrote: > I haven't tested on AMD. But I think AMD should have the same code. Again, bear in mind, this is a qemu+kvm guest. > Could you please check if > /sys/device/system/cpu/cpu#/cache/index#/shared_cpu_map contains only > the cpu itself?

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 07:08:56PM +, Yu, Fenghua wrote: > For L3 schema on a two socket system which has two L3 caches, user input: > L3:0=3;1=f Ok, so you basically want to read out the cache id from sysfs so that userspace can configure CAT properly. Thanks for the detailed writeup. Btw,

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 07:08:56PM +, Yu, Fenghua wrote: > For L3 schema on a two socket system which has two L3 caches, user input: > L3:0=3;1=f Ok, so you basically want to read out the cache id from sysfs so that userspace can configure CAT properly. Thanks for the detailed writeup. Btw,

RE: [PATCH] cacheinfo: Introduce cache id

<h.peter.an...@intel.com>; Peter Zijlstra <pet...@infradead.org>; > Stephane Eranian <eran...@google.com>; Shankar, Ravi V > <ravi.v.shan...@intel.com>; Vikas Shivappa > <vikas.shiva...@linux.intel.com>; linux-kernel ker...@vger.kernel.org>; x86 <x...@ker

RE: [PATCH] cacheinfo: Introduce cache id

er...@vger.kernel.org>; x86 > Subject: Re: [PATCH] cacheinfo: Introduce cache id > > On Fri, Jul 01, 2016 at 06:01:06PM +, Yu, Fenghua wrote: > > Cache id is unique on the same level of cache across platform. > > Btw, I forgot to ask in the reply to Tony: how are tho

RE: [PATCH] cacheinfo: Introduce cache id

> From: Borislav Petkov [mailto:b...@suse.de] > Sent: Friday, July 01, 2016 11:40 AM > On Fri, Jul 01, 2016 at 06:32:19PM +, Yu, Fenghua wrote: > > We has prefix "L3" or "L2" in the syntax, id is for that level in each > > line.b > > Give me a full example, please, how the id is going to be

RE: [PATCH] cacheinfo: Introduce cache id

> From: Borislav Petkov [mailto:b...@suse.de] > Sent: Friday, July 01, 2016 11:40 AM > On Fri, Jul 01, 2016 at 06:32:19PM +, Yu, Fenghua wrote: > > We has prefix "L3" or "L2" in the syntax, id is for that level in each > > line.b > > Give me a full example, please, how the id is going to be

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 11:00:35AM -0700, Luck, Tony wrote: > For CAT we only need the IDs to be unique at each level. Our tentative > syntax for the schema file for CAT looks like this (for a theoretical > system supporting CAT in both L2 and L3 with two L3 caches and eight L2 > caches) > >

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 11:00:35AM -0700, Luck, Tony wrote: > For CAT we only need the IDs to be unique at each level. Our tentative > syntax for the schema file for CAT looks like this (for a theoretical > system supporting CAT in both L2 and L3 with two L3 caches and eight L2 > caches) > >

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 06:32:19PM +, Yu, Fenghua wrote: > We has prefix "L3" or "L2" in the syntax, id is for that level in each line.b Give me a full example, please, how the id is going to be used. Thanks. -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 06:32:19PM +, Yu, Fenghua wrote: > We has prefix "L3" or "L2" in the syntax, id is for that level in each line.b Give me a full example, please, how the id is going to be used. Thanks. -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 06:01:06PM +, Yu, Fenghua wrote: > Cache id is unique on the same level of cache across platform. Btw, I forgot to ask in the reply to Tony: how are those cache IDs exactly going to be used? An example please... > Could you check cpu#/cache/index#/shared_cpu_map or

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 06:01:06PM +, Yu, Fenghua wrote: > Cache id is unique on the same level of cache across platform. Btw, I forgot to ask in the reply to Tony: how are those cache IDs exactly going to be used? An example please... > Could you check cpu#/cache/index#/shared_cpu_map or

RE: [PATCH] cacheinfo: Introduce cache id

h.peter.an...@intel.com>; Peter Zijlstra <pet...@infradead.org>; > Stephane Eranian <eran...@google.com>; Shankar, Ravi V > <ravi.v.shan...@intel.com>; Vikas Shivappa > <vikas.shiva...@linux.intel.com>; linux-kernel ker...@vger.kernel.org>; x86 <x...@ker

RE: [PATCH] cacheinfo: Introduce cache id

er...@vger.kernel.org>; x86 > Subject: Re: [PATCH] cacheinfo: Introduce cache id > > On Fri, Jul 01, 2016 at 11:00:35AM -0700, Luck, Tony wrote: > > For CAT we only need the IDs to be unique at each level. Our tentative > > syntax for the schema file for CAT looks like this (

RE: [PATCH] cacheinfo: Introduce cache id

h.peter.an...@intel.com>; Peter Zijlstra <pet...@infradead.org>; > Stephane Eranian <eran...@google.com>; Shankar, Ravi V > <ravi.v.shan...@intel.com>; Vikas Shivappa > <vikas.shiva...@linux.intel.com>; linux-kernel ker...@vger.kernel.org>; x86 <x...@ker

RE: [PATCH] cacheinfo: Introduce cache id

er...@vger.kernel.org>; x86 > Subject: Re: [PATCH] cacheinfo: Introduce cache id > > On Fri, Jul 01, 2016 at 09:50:41AM -0700, Luck, Tony wrote: > > Here's the situation. We have lots of (mostly) independent caches on a > system. > > The L3 cache (also called LLC - La

Re: [PATCH] cacheinfo: Introduce cache id

> Basically all cache indices carry the APIC ID of the core, so L1D on > CPU0 has ID 0 and then L1I has ID 0 too and then L2 has also the same > ID. > > How does that look on a CAT system? Do all the different cache levels > get different IDs? For CAT we only need the IDs to be unique at each

Re: [PATCH] cacheinfo: Introduce cache id

> Basically all cache indices carry the APIC ID of the core, so L1D on > CPU0 has ID 0 and then L1I has ID 0 too and then L2 has also the same > ID. > > How does that look on a CAT system? Do all the different cache levels > get different IDs? For CAT we only need the IDs to be unique at each

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 09:50:41AM -0700, Luck, Tony wrote: > Here's the situation. We have lots of (mostly) independent caches on a > system. > The L3 cache (also called LLC - Last Level Cache - in some documentation) is > usually shared by all cpus on a physical socket. The L1 and L2 caches

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 09:50:41AM -0700, Luck, Tony wrote: > Here's the situation. We have lots of (mostly) independent caches on a > system. > The L3 cache (also called LLC - Last Level Cache - in some documentation) is > usually shared by all cpus on a physical socket. The L1 and L2 caches

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 12:21:43PM +0200, Borislav Petkov wrote: > On Wed, Jun 29, 2016 at 06:56:10PM -0700, Fenghua Yu wrote: > > From: Fenghua Yu > > > > Each cache node is described by cacheinfo and is a unique node across > > What is a cache node? Clearly not a good

Re: [PATCH] cacheinfo: Introduce cache id

On Fri, Jul 01, 2016 at 12:21:43PM +0200, Borislav Petkov wrote: > On Wed, Jun 29, 2016 at 06:56:10PM -0700, Fenghua Yu wrote: > > From: Fenghua Yu > > > > Each cache node is described by cacheinfo and is a unique node across > > What is a cache node? Clearly not a good name for the concept we

Re: [PATCH] cacheinfo: Introduce cache id

On Wed, Jun 29, 2016 at 06:56:10PM -0700, Fenghua Yu wrote: > From: Fenghua Yu > > Each cache node is described by cacheinfo and is a unique node across What is a cache node? > the platform. But there is no id for a cache node. We introduce cache ID > to identify a cache

Re: [PATCH] cacheinfo: Introduce cache id

On Wed, Jun 29, 2016 at 06:56:10PM -0700, Fenghua Yu wrote: > From: Fenghua Yu > > Each cache node is described by cacheinfo and is a unique node across What is a cache node? > the platform. But there is no id for a cache node. We introduce cache ID > to identify a cache node. > > Intel Cache