linux-kernel - Re: [RESEND][PATCH] mm: vmstats: tlb flush counters

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Message-ID: <51EA8C23.5070408@linux.vnet.ibm.com>
Date:	Sat, 20 Jul 2013 18:39:55 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Dave Hansen <dave@...1.net>
CC:	Raghavendra KT <raghavendra.kt.linux@...il.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org
Subject: Re: [RESEND][PATCH] mm: vmstats: tlb flush counters

On 07/19/2013 08:50 PM, Dave Hansen wrote:
> On 07/19/2013 04:38 AM, Raghavendra KT wrote:
>> While measuring non - PLE performance, one of the bottleneck, I am seeing is
>> flush tlbs.
>> perf had helped in alaysing a bit there, but this patch would help
>> in precise calculation. It will aslo help in tuning the PLE window
>> experiments (larger PLE window
>> would affect remote flush TLBs)
>
> Interesting.  What workload is that?  I've been having problems finding
> workloads that are too consumed with TLB flushes.
>

Dave,
ebizzy is the one. and dbench to some small extent.

[root@...eblue ~]# cat /proc/vmstat  |grep nr_tlb ; 
/root/data/script/do_ebizzy.sh;  cat /proc/vmstat  |grep nr_tlb
nr_tlb_remote_flush 721
nr_tlb_remote_flush_received 923
nr_tlb_local_flush_all 13992
nr_tlb_local_flush_one 0
nr_tlb_local_flush_one_kernel 0
7482 records/s
real 120.00 s
user 86.69 s
sys  3746.57 s
nr_tlb_remote_flush 912896
nr_tlb_remote_flush_received 28261974
nr_tlb_local_flush_all 926272
nr_tlb_local_flush_one 0
nr_tlb_local_flush_one_kernel 0

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