Messages in this thread | | | Date | Thu, 23 Jan 2003 20:26:18 -0500 | Subject | Re: big ext3 sequential write improvement in 2.5.51-mm1 gone in 2.5.53-mm1? | From | rwhron@earthlin ... |
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>> >lovely. These two files have perfectly intermingled blocks.
>> Writeback? or read?
> Both.
> The fileystems need fixing....
Did you add a secret sauce to 2.5.59-mm2? 10x sequential write improvement on ext3 for multiple tiobench threads.
Quad P3 Xeon (4GB ram) 8 GB files 4K blocksize 32 threads Rate = MB/sec latency in milliseconds
Sequential Writes ext3 Avg Maximum Lat% Lat% CPU Kernel Rate (CPU%) Latency Latency >2s >10s Eff ---------- ------------------------------------------------------------ 2.4.20aa1 11.85 72.77% 11.814 21802.73 0.05036 0.00000 16 2.5.59 3.42 17.36% 83.976 3109518.52 0.11253 0.05088 20 2.5.59-mm2 32.39 34.28% 7.742 340597.62 0.04287 0.01765 94
Similar improvement for seq writes for 2, 4, 8, 16, 64, 128, 256 threads.
Sequential reads on ext3 with 2.5.59-mm2 improves around 3x for various thread counts. Below is 32 threads.
Sequential Reads ext3 Avg Maximum Lat% Lat% CPU Kernel Rate (CPU%) Latency Latency >2s >10s Eff ---------- ------------------------------------------------------------ 2.4.20aa1 8.24 7.21% 28.587 449134.11 0.10395 0.07086 114 2.5.59 9.50 5.50% 36.703 4310.62 0.00000 0.00000 173 2.5.59-mm2 35.28 17.69% 10.173 18950.56 0.01010 0.00000 199
-- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html
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