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das_leid
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PostPosted: Mon Oct 31, 2005 8:37 am    Post subject: Re: Performance Tips for Kernel 2.6 Reply with quote

wgi wrote:
No. I get 10.5 - 11 MB/s between our Servers/Workstations (Full Duplex).


I realized that too. NFS and SAMBA is way faster. But I wonder: Do you consider a 2*550 Mhz Server too slow for SSH and SCP ? Hmm, need to check that with my 1.6ghz notebook and my 1.5 ghz amd.

Cheers,
Das_Leid
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frilled
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PostPosted: Mon Oct 31, 2005 9:21 am    Post subject: Re: Performance Tips for Kernel 2.6 Reply with quote

Quote:
I realized that too. NFS and SAMBA is way faster. But I wonder: Do you consider a 2*550 Mhz Server too slow for SSH and SCP ? Hmm, need to check that with my 1.6ghz notebook and my 1.5 ghz amd.


SMB sucks Royal Arse. I used it. It sucks. Now I use shfs for everything between the Linuxes. I'll have to get rid of the samba daemons, too, since it still doesn't work reliably in a Windoze 2003 domain environment. Guess I'll have to install Cygwin on all Windoze servers 8)
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Monkeh
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PostPosted: Mon Oct 31, 2005 1:13 pm    Post subject: Re: Performance Tips for Kernel 2.6 Reply with quote

das_leid wrote:
PS: NEVER EVER I am going to use a 3com 3c905B-TX in my network. They play ping-pong with your interrupts and effectively increase your RX error rate.


B as in Boomerang? I know how you feel. My home server has one built in and it likes to screw with me.
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tSp
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PostPosted: Mon Oct 31, 2005 11:12 pm    Post subject: Re: Performance Tips for Kernel 2.6 Reply with quote

wgi wrote:
Quote:
Well, I'd like to say thanks. Using your guide my overall network performance increased from 2.9MB/s to 6.6MB/s.
I wonder if this is the practical maximum of a SCP connection in a 100Mbit network?!


No. I get 10.5 - 11 MB/s between our Servers/Workstations (Full Duplex). But you need some horsepower for ssh. Since there's virtually nothing slower than 2.4 GHz x86 (at least of those who speak ssh ;-) I almost always get full speed. But with a slow machine the protocol and encryption becomes the bottleneck.


a little off topic for the thread, but when using scp you can get much faster speeds by using blowfish, i.e.
# scp -c blowfish file user@host:/directory
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JATMAN
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PostPosted: Tue Nov 15, 2005 1:45 am    Post subject: Reply with quote

moosh wrote:
Hi wgi,

I just found these two links which explain the problem:
http://bugzilla.kernel.org/show_bug.cgi?id=5165 and http://bugs.gentoo.org/show_bug.cgi?id=110661.


I had the same problem with a big slowdown after upgrading to the 2.6.14 kernel. Unsetting SMP solved the problem for me too. Thanks! This thread helped me a lot.

JATMAN
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brazzmonkey
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PostPosted: Tue Jan 24, 2006 8:45 pm    Post subject: Reply with quote

great tips !! my system doesn't lag any more ! though there are a few options i couldn't find.

thanks !!
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halfgaar
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PostPosted: Tue Jan 24, 2006 11:46 pm    Post subject: Reply with quote

Whatever I do, my system keeps lagging too much. Every minute or so it hangs for 0.5 sec. In games this is particularly annoyting. Things like cron, or regular-interval mailcheckers are suspect here, but disabling them doesn't help. Also, I find it rather low-tech that any task can lock up my system that hard for a time.

Well, I guess when my new AMD dual core arrives, it'll all be better :)
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purpler
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PostPosted: Fri Jun 22, 2007 12:15 pm    Post subject: Reply with quote

halfgar,probably bad kernel config..
try do it once more from scratch :twisted:
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halfgaar
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PostPosted: Fri Jun 22, 2007 12:47 pm    Post subject: Reply with quote

A reply to an old thread :)

By now, I have that dual core Athlon X2, and it's indeed all better. I still think it shouldn't have happened on my old machine, but it's no longer really relevant. I do believe that my kernel config was proper BTW. I've gone by every option mentioned in kernel performance threads, and I pretty much know what I'm doing.

The problem may also have been just the mouse movement. My mouse is USB and USB doesn't have a very high interrupt priority. There is a reason the keyboard interrupt is the highest, besides the timer. It's pretty strange that we nowadays have an input device on one of the lowest priorities.
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P0w3r3d
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PostPosted: Sat Nov 14, 2009 2:18 pm    Post subject: Reply with quote

any updates??? there are many improvements into the kernel code.. this is the same??
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