On 11/23/2015 2:52 PM, Stephen Hemminger wrote:
> On Mon, 23 Nov 2015 05:05:21 +
> "Xie, Huawei" wrote:
>
>> On 11/23/2015 12:07 PM, Stephen Hemminger wrote:
>>> On Mon, 23 Nov 2015 03:46:31 +
>>> "Xie, Huawei" wrote:
>>>
> Why cannot we rely on the kernel zeroing the memory ?
>
On Mon, Nov 23, 2015 at 02:54:54AM +, Xie, Huawei wrote:
I checked shared mapping with MAP_POPULATE between two processes. It
> works. Then i did some search, find the manual is also ambiguous to
> others and thus have been changed, :).
> Before: MAP_POPULATE is only supported for private
On 11/23/2015 12:07 PM, Stephen Hemminger wrote:
> On Mon, 23 Nov 2015 03:46:31 +
> "Xie, Huawei" wrote:
>
>>> Why cannot we rely on the kernel zeroing the memory ?
>>> If that behavior were to change, then we can zero out the memory
>>> ourselves.
>> It is undocumented kernel behavior. My
0 PM
>>>> To: Wang, Zhihong ; dev at dpdk.org
>>>> Subject: RE: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove
>>>> unnecessary
>>>> hugepage zero-filling
>>>>
>>>>
>>>>
>>>>> -Original Messag
> Hemminger
>>>> Sent: Thursday, November 19, 2015 3:09 AM
>>>> To: Richardson, Bruce
>>>> Cc: dev at dpdk.org
>>>> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove
>>>> unnecessary hugepage zero-filling
>>>>
>>
On Mon, 23 Nov 2015 05:05:21 +
"Xie, Huawei" wrote:
> On 11/23/2015 12:07 PM, Stephen Hemminger wrote:
> > On Mon, 23 Nov 2015 03:46:31 +
> > "Xie, Huawei" wrote:
> >
> >>> Why cannot we rely on the kernel zeroing the memory ?
> >>> If that behavior were to change, then we can zero out
On Mon, 23 Nov 2015 03:46:31 +
"Xie, Huawei" wrote:
> >
> > Why cannot we rely on the kernel zeroing the memory ?
> > If that behavior were to change, then we can zero out the memory
> > ourselves.
> It is undocumented kernel behavior. My opinion is if not a big burden,
> zero out the
phen Hemminger
> > > Sent: Wednesday, November 18, 2015 4:00 PM
> > > To: Xie, Huawei
> > > Cc: dev at dpdk.org
> > > Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
> > > hugepage zero-filling
> > >
> > > On Wed
er
>>>> Sent: Thursday, November 19, 2015 3:09 AM
>>>> To: Richardson, Bruce
>>>> Cc: dev at dpdk.org
>>>> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove
>>>> unnecessary hugepage zero-filling
>>>>
>>
dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
>>> hugepage zero-filling
>>>
>>>
>>>
>>>> -Original Message-
>>>> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Zhihong Wang
>>>> Sent: Wedne
> -Original Message-
> From: Xie, Huawei
> Sent: Thursday, November 19, 2015 2:05 PM
> To: Wang, Zhihong ; Stephen Hemminger
> ; Richardson, Bruce
>
> Cc: dev at dpdk.org
> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
> hugepage
On 11/19/2015 11:54 AM, Wang, Zhihong wrote:
>
>> -Original Message-
>> From: Xie, Huawei
>> Sent: Wednesday, November 18, 2015 8:08 PM
>> To: Wang, Zhihong ; Mcnamara, John
>> ; dev at dpdk.org
>> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_e
lto:dev-bounces at dpdk.org] On Behalf Of Stephen
>>>> Hemminger
>>>> Sent: Wednesday, November 18, 2015 4:00 PM
>>>> To: Xie, Huawei
>>>> Cc: dev at dpdk.org
>>>> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove
>>
> -Original Message-
> From: Xie, Huawei
> Sent: Wednesday, November 18, 2015 8:08 PM
> To: Wang, Zhihong ; Mcnamara, John
> ; dev at dpdk.org
> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
> hugepage zero-filling
>
> On 11/18/
> -Original Message-
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Stephen Hemminger
> Sent: Thursday, November 19, 2015 3:09 AM
> To: Richardson, Bruce
> Cc: dev at dpdk.org
> Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
>
On 11/18/2015 6:45 PM, Wang, Zhihong wrote:
>> -Original Message-
>> From: Mcnamara, John
>> Sent: Wednesday, November 18, 2015 6:40 PM
>> To: Wang, Zhihong ; dev at dpdk.org
>> Subject: RE: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnece
Cc: dev at dpdk.org
> > Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
> > hugepage zero-filling
> >
> > On Wed, 18 Nov 2015 12:07:54 +
> > "Xie, Huawei" wrote:
> >
> > > >>> The kernel fills new al
> -Original Message-
> From: Mcnamara, John
> Sent: Wednesday, November 18, 2015 6:40 PM
> To: Wang, Zhihong ; dev at dpdk.org
> Subject: RE: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
> hugepage zero-filling
>
>
>
> > -Or
> -Original Message-
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Zhihong Wang
> Sent: Wednesday, November 18, 2015 3:27 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary
> hugepage zero-filling
>
&
On Wed, 18 Nov 2015 12:07:54 +
"Xie, Huawei" wrote:
> >>> The kernel fills new allocated (huge) pages with zeros.
> >>> DPDK just has to touch the pages to trigger the allocation.
> I think we shouldn't reply on the assumption that kernel has zeroed the
> memory. Kernel zeroes the memory
The kernel fills new allocated (huge) pages with zeros.
DPDK just has to touch the pages to trigger the allocation.
Signed-off-by: Zhihong Wang
---
lib/librte_eal/linuxapp/eal/eal_memory.c | 5 +
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git
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