Messages in this thread | | | From | Lorenzo Allegrucci <> | Subject | Re: 2.6.6-mm5 oops mounting ext3 or reiserfs with -o barrier | Date | Sun, 23 May 2004 22:41:13 +0200 |
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On Sunday 23 May 2004 19:31, Jens Axboe wrote:
> It just looks odd that eg reads vary as much as they do, and that -o > barrier=1 makes -W0 reads faster (and faster then -W1 even). remove > looks reasonable for -W1, but -W0 is still faster. That is _really_ odd.
I rerun all tests with noatime. Using noatime numbers look more predictable but I cannot guarantee any statistical relevance.
hdparm -W1 ext3 (-o barrier=0,noatime) untar read copy remove 0m56.744s 0m22.452s 1m26.558s 0m20.683s 0m7.187s 0m1.153s 0m0.747s 0m0.101s 0m6.077s 0m3.045s 0m9.132s 0m1.907s
ext3 (-o barrier=1,noatime) untar read copy remove 0m55.152s 0m21.340s 1m23.705s 0m19.369s 0m7.237s 0m1.217s 0m0.788s 0m0.077s 0m6.513s 0m3.082s 0m9.226s 0m1.507s
haparm -W0 ext3 (-o barrier=0,noatime) untar read copy remove 1m55.221s 0m23.768s 2m12.458s 0m22.256s 0m7.227s 0m1.216s 0m0.756s 0m0.085s 0m6.424s 0m3.002s 0m9.085s 0m1.560s
ext3 (-o barrier=1,noatime) untar read copy remove 1m56.578s 0m23.382s 2m14.117s 0m22.289s 0m7.035s 0m1.202s 0m0.766s 0m0.089s 0m6.814s 0m3.103s 0m9.141s 0m1.696s
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