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Following the bug reporting guide at www.kernel.org. Sending to linux-kernel@vger.kernel.org because I don't know where the problem lies, I've eliminated two areas (detailed below). PROBLEM: Stock 2.6.1 kernel shows reduced disk performance compared to stock 2.6.0. DESCRIPTION: 2.6.0 -- hdparm -Tt shows: ~70 M/s for a single drive ~110 M/s for 2-drive software RAID 0 array 2.6.1 -- hdparm -Tt shows: ~60 M/s for single drive ~90 M/s for 2-drive software RAID 0 array Kernel configuration file the same -- used .config from 2.6.0 with make oldconfig Reproducible: yes. Results remain consistent between the two kernels. This is the only change to the system. No other software or hardware was changed, just a straight kernel upgrade. Relevant specs: Athlon-XP 2800+ 1024M RAM Adaptec 29160 Two Maxtor 10k RPM U160 SCSI drives in md software RAID 0 array Linux version 2.6.1 (root@Agamemnon) (gcc version 3.3.2 20031218 (Gentoo Linux 3.3.2-r5, propolice-3.3-7)) PROGRESS: Patched 2.6.1 with the 2.6.0 aic7xxx SCSI driver in case it was a result of the new .36 version of the driver. Result: problem remains Patched 2.6.1 with the 2.6.0 md driver, since that was also shown to be updated in 2.6.1 Result: problem remains So, it doesn't appear to be a SCSI or md driver issue. Don't know where to go from here, reporting as bug. - 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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