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Just a side note, can you please run the 'iostat -xnpz 1' on your swift
nodes  and share results while downloading file , including network
performance tests suggested earlier ...

I would also suggest to share the logs on swift nodes would be much helpful
on this by enabling debug in config.

On Jan 4, 2017 22:51, "Rick Jones" <rick.jones2 at hpe.com> wrote:

> On 01/04/2017 12:59 AM, dongjh at ahope.com.cn wrote:
>
>> Hi experts
>>
>> I finished the swift installation following the install
>> guide(http://docs.openstack.org/project-install-guide/object
>> -storage/draft/get_started.html),
>> file upload  is very fast, but file download is extremely slow, why ?
>>
>> [root at controller admin]#* time openstack object create container1
>> cirros-0.3.4-x86_64-disk.img*
>> +------------------------------+------------+---------------
>> -------------------+
>> | object                       | container  | etag
>>      |
>> +------------------------------+------------+---------------
>> -------------------+
>> | cirros-0.3.4-x86_64-disk.img | container1 |
>> ee1eca47dc88f4879d8a229cc70a07c6 |
>> +------------------------------+------------+---------------
>> -------------------+
>>
>> real    0m3.807s
>> user    0m2.127s
>> sys     0m0.161s
>>
>>
>> [root at controller /]#* time  openstack object save container1
>> cirros-0.3.4-x86_64-disk.img*
>> real    5m51.489s
>> user    5m48.172s
>> sys     0m2.094s
>>
>
> Are you able to run something like netperf or iperf between your client
> and the swift proxy?  For example:
>
> netperf -H <proxy>    # get a feel for "to swift" basic network perf
> netperf -H <proxy> -t TCP_MAERTS # get a feel for "from swift"
>
> The idea there is to measure the network separate from the storage and
> swift processing, and go from there.
>
> If there isn't much else happening on your setup at the time, you could
> also look at some snapshots of netstat -s on the proxy when you are
> downloading the object - look to see if there are many TCP
> retransmissions.  You can get something similar "directly" for the netperf
> tests with:
>
> netperf -H <proxy> -- -o throughput,local_transport_ret
> rans,remote_transport_retrans
>
> netperf -H <proxy> -t TCP_MAERTS -- -o throughput,local_transport_ret
> rans,remote_transport_retrans
>
> rick jones
>
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