Messages in this thread |  | | Subject | Updated Linux kernel preemption patches | | From | Robert Love <> | | Date | 26 Aug 2001 21:57:43 -0400 |
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Available at:
http://tech9.net/rml/linux/patch-rml-2.4.9-preempt-kernel-1 http://tech9.net/rml/linux/patch-rml-2.4.8-ac12-preempt-kernel-1
for kernel 2.4.9 and 2.4.8-ac12, respectively.
This is a straight update of Nigel Gamble's Linux kernel preemption patch from http://kpreempt.sourceforge.net, updated for the above kernels. Thus, this is Nigel's code -- I merely updated it.
I am eager to see work done on the patch and to see what its future may be. If you are in any way interested in application latency or real-time support, I suggest you check this out. If you are just curious, its an interesting patch none-the-less.
Some benchmarks:
kernel 2.4.8-ac12 (nonpreempt): dbench 16: Throughput 12.9453 MB/sec (NB=16.1816 MB/sec 129.453 MBit/sec) dbench 1: Throughput 76.0099 MB/sec (NB=95.0123 MB/sec 760.099 MBit/sec) kernel compile (make dep clean bzImage): 7:35.51 (386.34s user, 23.41s system)
kernel 2.4.8-ac12 with preemptible kernel patch: dbench 16: Throughput 13.3579 MB/sec (NB=16.6974 MB/sec 133.579 MBit/sec) dbench 1: Throughput 31.4971 MB/sec (NB=39.3714 MB/sec 314.971 MBit/sec) kernel compile (make dep clean bzImage): 7:23.26 (387.10s user, 23.42s system)
The performance increase in kernel compile and dbench 16 is decent, but the decrease in dbench 1 is odd. I am curious what numbers others find. My "how does it feel" benchmark is that bandwidth seems similar while multitasking may be a tad smoother with the patch.
-- Robert M. Love rml at ufl.edu rml at tech9.net
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