Re: Memstore performance improvements v0.90 vs v0.87

[Alexandre DERUMIER <aderumier@odiso.com>]

>>One Other thing you could also check, is if transparent hugepages is enabled or not.
>>It's known to slowdown some applications, like databases for example. (So maybe memstore too)
>>
>>#cat /sys/kernel/mm/transparent_hugepage/enabled
>>    always madvise [never]

This is disabled by default is you use the network-latency tuned profile

https://developerblog.redhat.com/2015/02/11/low-latency-performance-tuning-rhel-7/


----- Mail original -----
De: "aderumier" <aderumier@odiso.com>
À: "Mark Nelson" <mnelson@redhat.com>
Cc: "Blair Bethwaite" <blair.bethwaite@gmail.com>, "James Page" <james.page@ubuntu.com>, "ceph-devel" <ceph-devel@vger.kernel.org>, "Stephen L Blinick" <stephen.l.blinick@intel.com>, "Jay Vosburgh" <jay.vosburgh@canonical.com>, "Colin Ian King" <colin.king@canonical.com>, "Patricia Gaughen" <patricia.gaughen@canonical.com>, "Leann Ogasawara" <leann.ogasawara@canonical.com>
Envoyé: Samedi 21 Février 2015 09:10:29
Objet: Re: Memstore performance improvements v0.90 vs v0.87

>>At least at first glance it doesn't look like it's enabled on either our 
>>RHEL7 or Ubuntu nodes. No numad running either. 

Do you have disable autonuma balancing manually ? 

because look at kernel config of both rhel7 and ubuntu, it's really seem to be enabled by default: 

CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y 
CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y 
CONFIG_NUMA_BALANCING=y 


>>No numad running either. 

AFAIK, numad was used by RHEL6, and auto-numabalancing is used since RHEL7. 




One Other thing you could also check, is if transparent hugepages is enabled or not. 
It's known to slowdown some applications, like databases for example. (So maybe memstore too) 

#cat /sys/kernel/mm/transparent_hugepage/enabled 
always madvise [never] 



----- Mail original ----- 
De: "Mark Nelson" <mnelson@redhat.com> 
À: "aderumier" <aderumier@odiso.com> 
Cc: "Blair Bethwaite" <blair.bethwaite@gmail.com>, "James Page" <james.page@ubuntu.com>, "ceph-devel" <ceph-devel@vger.kernel.org>, "Stephen L Blinick" <stephen.l.blinick@intel.com>, "Jay Vosburgh" <jay.vosburgh@canonical.com>, "Colin Ian King" <colin.king@canonical.com>, "Patricia Gaughen" <patricia.gaughen@canonical.com>, "Leann Ogasawara" <leann.ogasawara@canonical.com> 
Envoyé: Vendredi 20 Février 2015 17:12:46 
Objet: Re: Memstore performance improvements v0.90 vs v0.87 

On 02/20/2015 10:03 AM, Alexandre DERUMIER wrote: 
>>> http://rhelblog.redhat.com/2015/01/12/mysteries-of-numa-memory-management-revealed/ 
>>> It's possible that this could be having an effect on the results. 
> 
> Isn't auto numa balancing enabled by default since kernel 3.8 ? 

No idea, I'm behind the times on what's been going on with numa tuning. 

> 
> it can be checked with 
> 
> cat /proc/sys/kernel/numa_balancing 

At least at first glance it doesn't look like it's enabled on either our 
RHEL7 or Ubuntu nodes. No numad running either. 
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