Messages in this thread | | | From | Grant Coady <> | Subject | Re: 2.6 vs 2.4, ssh terminal slowdown | Date | Wed, 08 Feb 2006 13:50:10 +1100 |
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On Tue, 7 Feb 2006 21:24:11 -0500, Benjamin LaHaise <bcrl@kvack.org> wrote:
>On Wed, Feb 08, 2006 at 01:11:49PM +1100, Grant Coady wrote: >> This console sluggishness is noticeable enough on older hardware for me to >> forgo exercising 2.6.latest.stable bugs for much time on it ;) >> >> For those suffering deja vu, yes, I reported this last month (or, recently). > >This bug report is a bit vague in terms of what the problem is -- the >test case hits 3 major subsystems (io, vm, net), all of which have changed >rather substantially in the course of 2.6 development.
Vague 'cos I do not know where the problem is. One might say slowdown is like a near a 1ms delay per line output, but slowdown does not correlate to kernel tick frequency. :(
> Would it be possible >to profile the system using oprofile to get an idea what the hotspots are? Perhaps, I've yet to try that.
>Have you compared basic hard disk throughput with hdparm, as well as >ensuring DMA is enabled with 32 bit io? What about testing network >performance with netperf (or a netcat of /dev/zero)? A few more data points >would be quite helpful.
Yes, the gross datapoints such as basic net i/o, disk i/o, say 2.6 is better/faster than 2.4 on this hardware, my problem is how to describe measured console slowdown in terms meaningful to you.
I'll take a look at oprofile, report back if I can make sense of it ;)
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