On 01/04/2017 12:59 AM, don...@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@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@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_retrans,remote_transport_retrans
netperf -H <proxy> -t TCP_MAERTS -- -o
throughput,local_transport_retrans,remote_transport_retrans
rick jones
_______________________________________________
Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
Post to : openstack@lists.openstack.org
Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
