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> Hello Rafal, Hello, > However I find it quite possible to have reached the throughput limit > because of software (driver) problems. I have done various testing > (mostly "hdparm -tT" with exactly the same PC and disks since about > kernel 2.6.8 (maybe even earlier). I remember with certainty that read > throughput the early days was about 50MB/s for each of the big disks, > and combined with RAID 0 I got ~75MB/s. Those figures have been dropping > gradually with each new kernel release and the situation today, with > 2.6.22, is that hdparm gives maximum throughput 20MB/s for each disk, > and for RAID 0 too! Just tested (plain curiosity). via82cxxx average result @533MHz: /dev/hda: Timing cached reads: 232 MB in 2.00 seconds = 115.93 MB/sec Timing buffered disk reads: 64 MB in 3.12 seconds = 20.54 MB/sec pata_via average result @533MHz: /dev/sda: Timing cached reads: 234 MB in 2.01 seconds = 116.27 MB/sec Timing buffered disk reads: 82 MB in 3.05 seconds = 26.92 MB/sec Same 2.6.23-rc1-git11 kernel. Yes - constant 6MB/s difference (31%). Cool. > Dimitris Regards Rafał ---------------------------------------------------------------------- Jestes sexy? Dodaj swoje fotki i daj sie ocenic na >>>http://link.interia.pl/f1b21 - 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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