[dpdk-users] Failed to remap 2 MB pages

[dpdk-users] Failed to remap 2 MB pages

[Kumaraparameshwaran Rathnavel]

Hi All,

I am getting the error Failed to remap 2 MB pages when I give 32GB of memory to DPDK. I have a 256GB system and it was working for 16GB and I had 8192 number of Huge pages previously. Now for 32GB I have increased it to 16384 entries and I am facing this error. I guess this is not because of the unavailability of physical memory. 

Please correct me if I am wrong,

Thanking You,
Param.

Re: [dpdk-users] Failed to remap 2 MB pages

[Kyle Larose]

Could it have to do with memory fragmentation? What if you reboot? What if you configure the huge pages on the grub command line so they are allocated at boot?

-----Original Message-----
From: users [mailto:users-bounces@dpdk.org] On Behalf Of Kumaraparameshwaran Rathnavel
Sent: Tuesday, August 01, 2017 7:41 PM
To: users@dpdk.org; Wiles, Keith
Subject: [dpdk-users] Failed to remap 2 MB pages

Hi All,

I am getting the error Failed to remap 2 MB pages when I give 32GB of memory to DPDK. I have a 256GB system and it was working for 16GB and I had 8192 number of Huge pages previously. Now for 32GB I have increased it to 16384 entries and I am facing this error. I guess this is not because of the unavailability of physical memory. 

Please correct me if I am wrong,

Thanking You,
Param.

Re: [dpdk-users] Failed to remap 2 MB pages

[Kumaraparameshwaran Rathnavel]

Hi Kyle,

I have rebooted it couple of times. Did not have any impact, I doubt if that is the case because in the code before the mmap call there is check for the memory.

Please correct me if I am wrong.

Thanking You,
Param.
> On 02-Aug-2017, at 11:34 AM, Kyle Larose <klarose@sandvine.com> wrote:
> 
> Could it have to do with memory fragmentation? What if you reboot? What if you configure the huge pages on the grub command line so they are allocated at boot?
> 
> -----Original Message-----
> From: users [mailto:users-bounces@dpdk.org] On Behalf Of Kumaraparameshwaran Rathnavel
> Sent: Tuesday, August 01, 2017 7:41 PM
> To: users@dpdk.org; Wiles, Keith
> Subject: [dpdk-users] Failed to remap 2 MB pages
> 
> Hi All,
> 
> I am getting the error Failed to remap 2 MB pages when I give 32GB of memory to DPDK. I have a 256GB system and it was working for 16GB and I had 8192 number of Huge pages previously. Now for 32GB I have increased it to 16384 entries and I am facing this error. I guess this is not because of the unavailability of physical memory. 
> 
> Please correct me if I am wrong,
> 
> Thanking You,
> Param.

Re: [dpdk-users] Failed to remap 2 MB pages

[Wiles, Keith]

> On Aug 2, 2017, at 2:01 AM, Kumaraparameshwaran Rathnavel <krath@cloudsimple.com> wrote:
> 
> Hi Kyle,
> 
> I have rebooted it couple of times. Did not have any impact, I doubt if that is the case because in the code before the mmap call there is check for the memory.
> 
> Please correct me if I am wrong.

Do you setup your huge pages via the sysctl.conf file or by hand after you startup the system?

One other item is I had something similar in my dual socket machine. I could only get about 12K total 2megs pages in 64G machine 32G per socket. I increase the memory per socket and that allowed me to reach 16K pages total or 8K pages per socket. I did not understand why it happened I just assumed it was how Linux used memory. Sorry this most likely does not help much.

> 
> Thanking You,
> Param.
>> On 02-Aug-2017, at 11:34 AM, Kyle Larose <klarose@sandvine.com> wrote:
>> 
>> Could it have to do with memory fragmentation? What if you reboot? What if you configure the huge pages on the grub command line so they are allocated at boot?
>> 
>> -----Original Message-----
>> From: users [mailto:users-bounces@dpdk.org] On Behalf Of Kumaraparameshwaran Rathnavel
>> Sent: Tuesday, August 01, 2017 7:41 PM
>> To: users@dpdk.org; Wiles, Keith
>> Subject: [dpdk-users] Failed to remap 2 MB pages
>> 
>> Hi All,
>> 
>> I am getting the error Failed to remap 2 MB pages when I give 32GB of memory to DPDK. I have a 256GB system and it was working for 16GB and I had 8192 number of Huge pages previously. Now for 32GB I have increased it to 16384 entries and I am facing this error. I guess this is not because of the unavailability of physical memory. 
>> 
>> Please correct me if I am wrong,
>> 
>> Thanking You,
>> Param.
> 

Regards,
Keith