[Linux] Network stalls
Peter Capazzi
linux@flux.org
Thu, 19 Jun 2008 10:22:16 -0400
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Actually... same box.
=20
It's a blade server. 4 blades. 3 of them I own and have identical OS'
installed (Suse 10).=20
=20
Blade1 copy to Blade2 -> 30-40 MB/s dipped occassionally to 18... but
recovered well back into 30-40.=20
Blade1 copy to Blade3 -> 30-33 MB/s dipped to 12-14 MB/s... doesn't
recover... if anyting goes down again to 5-7... then to KB's.=20
=20
It's inconsistent... the time at which the bandwidth drops is different
each time... sometimes it gets down to 12-14 and manages to stay there.=20
=20
________________________________
From: linux-admin@flux.org [mailto:linux-admin@flux.org] On Behalf Of
Adam Glass
Sent: Thursday, June 19, 2008 10:16 AM
To: linux@flux.org
Subject: Re: [Linux] Network stalls
Are the servers in the same building, on an internal network? Or are
you going over the internet? If the latter, some ISPs are starting to
throttle traffic. I thought they were only doing that to bittorrent,
but maybe some ISPs do it to any large file transfer.
--Adam
On Thu, Jun 19, 2008 at 9:50 AM, Peter Capazzi
<pcapazzi@dwcsolutions.com> wrote:
I'm having some trouble copying files from one server to
another. When scp'ing the bandwidth starts out great (33 MB/s) and then
within a few minutes it deteriorates to (15 MB/s), then starts stalling
and sputtering to finish the file.=20
=20
Has anyone seen a behavior like this before? Any suggestions to
resolve?
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Actually... same box.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>It's a blade server. 4 blades. 3 of them I own =
and have=20
identical OS' installed (Suse 10). </FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Blade1 copy to Blade2 -> 30-40 MB/s dipped =
occassionally=20
to 18... but recovered well back into 30-40. </FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Blade1 copy to Blade3 -> 30-33 MB/s dipped =
to 12-14=20
MB/s... doesn't recover... if anyting goes down again to 5-7... then to =
KB's.=20
</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>It's inconsistent... the time at which the =
bandwidth drops=20
is different each time... sometimes it gets down to 12-14 and manages to =
stay=20
there. </FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D214121414-19062008><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> linux-admin@flux.org=20
[mailto:linux-admin@flux.org] <B>On Behalf Of </B>Adam =
Glass<BR><B>Sent:</B>=20
Thursday, June 19, 2008 10:16 AM<BR><B>To:</B> =
linux@flux.org<BR><B>Subject:</B>=20
Re: [Linux] Network stalls<BR></FONT><BR></DIV>
<DIV></DIV>Are the servers in the same building, on an internal network? =
Or are you going over the internet? If the latter, some ISPs =
are=20
starting to throttle traffic. I thought they were only doing that =
to=20
bittorrent, but maybe some ISPs do it to any large file =
transfer.<BR><BR>
<DIV>--Adam</DIV>
<DIV><BR></DIV>
<DIV><BR>
<DIV class=3Dgmail_quote>On Thu, Jun 19, 2008 at 9:50 AM, Peter Capazzi =
<<A=20
href=3D"mailto:pcapazzi@dwcsolutions.com">pcapazzi@dwcsolutions.com</A>&g=
t;=20
wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote=20
style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc =
1px solid">
<DIV>
<DIV><SPAN><FONT face=3DArial size=3D2>I'm having some trouble copying =
files from=20
one server to another. When scp'ing the bandwidth starts out great (33 =
MB/s)=20
and then within a few minutes it deteriorates to (15 MB/s), then =
starts=20
stalling and sputtering to finish the file. </FONT></SPAN></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><SPAN><FONT face=3DArial size=3D2>Has anyone seen a behavior like =
this=20
before? Any suggestions to=20
resolve?</FONT></SPAN></DIV></DIV></BLOCKQUOTE></DIV><BR></DIV></BODY></H=
TML>
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