Messages in this thread |  | | Date | Thu, 10 May 2001 10:23:48 +0900 (JST) | Subject | Re: Linux 2.4 Scalability, Samba, and Netbench | From | Kenichi Okuyama <> |
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>>>>> "AMT" == Andrew M Theurer <atheurer@austin.ibm.com> writes: AMT> I would like to help improve SMP scalability on this workload. If you AMT> have questions or comments about the above results, or if you are AMT> conducting similar tests, please send email to AMT> lse-tech@lists.sourceforge.net. I have some ideas on my next steps, AMT> but would like to discuss first.
Did you check vmstat result of each benchmarks?
Most of the problems are caused due to kernel. If you look at result of vmstat, more than 80% CPU time are used in kernel.
It's true that heavy kernel overhead is due to Samba, and is due to Samba generating lot's and lot's of request against kernels ( not only disk IO, but it requires many signal handling etc ).
So, there's really two things we need to do.
1) make Linux more scalable. ( This sometimes seems as if it's tuning, but it's really bug fix. So, don't ask performance team to tune. Let them FIX. )
2) make Samba work in less signals. This means, don't call useless system calls, use shared memory more effectively, divide Samba source into OS dependent part and independent part so that you can do tuning for specific OS and still have wide userland, etc. ---- Kenichi Okuyama. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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