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Am 04.01.2012 16:24, schrieb Donald Pearson:
<blockquote
cite="mid:CAC=t97D=TdUgOs-T9m3cdYHT2ohgbOK-K0N41SjUTp21dc92Bg@mail.gmail.com"
type="cite">Perhaps it's time to look at a pcap of the rsync
transfer. Throughput is in the aggregate over time, I've seen
instances where there are excessively long delays between packets
causing a low overall throughput.<br>
</blockquote>
<br>
Ok, verry good idea!<br>
I try this and post the results.<br>
<blockquote
cite="mid:CAC=t97D=TdUgOs-T9m3cdYHT2ohgbOK-K0N41SjUTp21dc92Bg@mail.gmail.com"
type="cite">
<br>
<div class="gmail_quote">On Wed, Jan 4, 2012 at 5:06 AM, Rainer
Pietsch <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:rp.rsync@pcs-at.com">rp.rsync@pcs-at.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
Am 04.01.2012 10:46, schrieb Hendrik Visage:<br>
<div>
<div class="h5">> On Tue, Jan 3, 2012 at 3:42 PM, R.
Pietsch <<a moz-do-not-send="true"
href="mailto:rp.rsync@pcs-at.com">rp.rsync@pcs-at.com</a>>
wrote:<br>
>> Hi!<br>
>><br>
>> I do a rsync between 2 machines. The throughput
is only 2 MByte/Sec.<br>
>><br>
>> Each machine is a Supermicro server with<br>
>> 2 x 8 Core Opteron 6128<br>
>> 64 GByte of ECC RAM<br>
>> 1 LSI MegaRAID SAS 9280-24i4e<br>
>> 24 x 2TByte SATA Disks as a RAID6<br>
>> 2 Intel Corporation 82599EB 10-Gigabit
SFI/SFP+ Network-cards<br>
>><br>
>> Both run Ubuntu 11.04 64Bit.<br>
>> Both use rsync version 3.0.7 protocol version 30<br>
>><br>
>> There are no errors reported.<br>
>> The local read and write rate to the disks is 1,1
GB/s.<br>
>> A network test shows 800MByte/s over the direct
coupled network-cards.<br>
>> The CPU-usage is 5 to 7% of one core.<br>
>> Memory-usage is 1703 out of 64557MB.<br>
>> There are no other jobs running on the two
machines.<br>
>> The LSI controllers both say: State: Optimal<br>
>><br>
>><br>
>> machine A has a rsync-daemon with the following
configuration:<br>
>> ----------<br>
>> read only = false<br>
>> use chroot = false<br>
>> hosts allow = <a moz-do-not-send="true"
href="http://10.99.11.0/24" target="_blank">10.99.11.0/24</a><br>
>> [Daten1]<br>
>> path = /var/daten1<br>
>> use chroot = yes<br>
>> read only = yes<br>
>> list = yes<br>
>> uid = root<br>
>> gid = root<br>
>> strict modes = yes<br>
>> ignore errors = no<br>
>> ignore nonreadable = yes<br>
>> transfer logging = no<br>
>> timeout = 600<br>
>> refuse options = checksum dry-run<br>
>> dont compress = *<br>
>> ----------<br>
>><br>
>> machine B runs:<br>
>><br>
>> /usr/bin/rsync -ax --numeric-ids --delete
--delete-excluded \<br>
>> --exclude-from=/Backup/RB_None.excl \<br>
>> --link-dest=/Backup/Base/xxxxx \<br>
>> rsync://<a moz-do-not-send="true"
href="http://root@10.99.11.11/Daten1/" target="_blank">root@10.99.11.11/Daten1/</a>
\<br>
>> /Backup/Base/yyyyyyy \<br>
>> --no-c --no-z<br>
>><br>
>> The files are all about 8 MB in size.<br>
>><br>
>> 8302592 100% 1.98MB/s 0:00:04 (xfer#861,
to-check=51173/94679)<br>
>><br>
>> The same - slow - transfer happens at 1GB and 5GB
files.<br>
>><br>
>><br>
>> Any ideas what can cause this slow transmission?<br>
><br>
> You do have jumbo frames enabled on both servers and
the network<br>
> equipment in between?<br>
><br>
> Do check the TCP/IP stack parameters, as most
bandwidth testing is<br>
> done with UDP.<br>
</div>
</div>
Jumbo frames are NOT enabled - (they cause trouble with samba)
and the<br>
test is done with netperf and tcp.<br>
The result is<br>
-----------------------<br>
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
10.99.11.11<br>
(10.99.11.11) port 0 AF_INET : demo<br>
Recv Send Send<br>
Socket Socket Message Elapsed<br>
Size Size Size Time Throughput<br>
bytes bytes bytes secs. 10^6bits/sec<br>
<br>
87380 16384 16384 10.00 7300.70<br>
<br>
-----------------------<br>
So we get 7.3 GBit with a tcp-stream - rawly 800MByte/sec<br>
<div class="im"><br>
<br>
--<br>
Mit freundlichen Grüßen / best regards<br>
<br>
Ing. Rainer Pietsch<br>
----------------------------------------------------------<br>
PCS - Pichler Computer Systeme<br>
Inh. Claudia Pichler-Pietsch<br>
Hauptplatz 10<br>
A-2751 Steinabrückl<br>
Österreich / Austria<br>
----------------------------------------------------------<br>
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