Rogier Wolff <R.E.Wolff@xxxxxxxxxxxx> writes: > Unquoted text below is from either me or from my friend. > > > Someone suggested we try an older kernel as if kernel 2.6.32 would not > have this problem. We do NOT think it suddenly started with a certain > kernel version. I was just hoping to have you kernel-guys help with > prodding the kernel into revealing which component was screwing things > up.... [...] > ata3.00: ATA-8: WDC WD10EARS-00Y5B1, 80.00A80, max UDMA/133 This is an "Advanced format" drive, which, in this case, means it internally has a 4KB sector size and exports a 512byte logical sector size. If your partitions are misaligned, this can cause performance problems. > MDstat: > > Personalities : [raid1] [raid6] [raid5] [raid4] > md125 : active raid5 sdd3[5](S) sdb3[4] sda3[0] sdc3[3] > 3903488 blocks super 1.1 level 5, 512k chunk, algorithm 2 [3/3] [UUU] > > md126 : active raid5 sda4[0] sdd4[3] sdc4[5](S) sdb4[4] > 1910063104 blocks super 1.1 level 5, 512k chunk, algorithm 2 > [3/3] [UUU] > > md1 : active raid5 sda2[0] sdd2[3](S) sdb2[1] sdc2[4] > 39067648 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] > [3/3] [UUU] > > md1 : active raid5 sda2[0] sdd2[3](S) sdb2[1] sdc2[4] > 39067648 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] > [UUU] A 512KB raid5 chunk with 4KB I/Os? That is a recipe for inefficiency. Again, blktrace data would be helpful. Cheers, Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
