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And one other item. Setting the build to preemptible kernel seems to improve I/O performance relative to 2.6.9, if you don't use it, the console has long periods where user processes are getting starved under extremely heavy I/O loads. Jeff jmerkey wrote: > jmerkey wrote: > >> Nick Piggin wrote: >> >>> Jeff V. Merkey wrote: >>> >>>> >>>> Verified. These numbers reflect my measurements as well. I have not >>>> moved off 2.6.9 to newer kernels on shipping products due to these >>>> issues. There are also serious stability issues as well, though >>>> 2.6.14 seems a little better than than previous kernels. Jeff >>>> >>> >>> These issues aren't going to fix themselves. Did you investigate >>> any of the performance or (more importantly) stability problems? >> >> >> > Added a little more clarification. > > Jeff > >> Yes I did. The list wasn't too long. I had problems with RCU messages >> and irq warn messages at very high loads and init respawning itself >> subjected to loads > 369 MB/S to the disk channels on 2.6.13. >> Performance was down on disk I/O [vs.] 2.6.9. I did not investigate >> the BIO fixes but something changed there. Theres also some memory >> problems with corruption somewhere in the 2.6.14 (during module >> unload and shutdown). >> >> Jeff >> > > - > 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/ > - 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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