Messages in this thread | | | Date | Fri, 18 Sep 2015 15:10:08 +0100 | From | Julien Grall <> | Subject | Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux |
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Hi Roger,
On 14/09/15 13:08, Roger Pau Monné wrote: > Well, absolute numbers together with the standard deviation are IMHO the > best way to provide those figures (ie: see ministat(1) output for > example), but percentages should also be fine. > > I'm just interested in knowing the performance difference between having > this patches applied or not when using 4KB pages on the frontend and the > backend.
I did some benchmark: DOM0: 1 VCPU, 4G of RAM based on 4.3-rc1 without this series GUEST: 4 VPUs, 4G of RAM, second disk associate to a nullbk device
I used fio with the following options
42sh> fio --name=test --ioengine=libaio --rw=read --numjobs=8 \ --iodepth=32 --time_based=1 --runtime=30 --bs=4KB \ --filename=/dev/xvdb--direct=1 --group_reporting=1 --iodepth_batch=16
The guest is also based on 4.3-rc1 with and without the series.
The overhead with my series is about 0.56%.
Regards,
-- Julien Grall
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