Recently, I've acquired a Dell 1750 PowerEdge with LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra 320 SCSI (rev 07). I booted kernel 2.6.13 and got these results with hdparm: /dev/sda: 59.25 MB/sec /dev/sdb: 3.18 MB/sec These two harddrives are identical so the speed should be similar. I tried more up-to-date kernels: 2.6.14-rc3-git5 and 2.6.14-rc2-mm2, and got the same result. A search on google revealed this thread on Linux kernel mailing list: "As of 2.6.13-rc1 Fusion-MPT very slow" (from around Aug 1, 2005). Somebody had the same problem as I am having right now. In the thread, James Bottomley provided a patch against -mm kernel that solved this problem. I tried that patch but it is out-of-date. I then fetched an older kernel, 2.6.13-rc5-mm1, and applied the patch without a problem. I then rebooted and the patch fixed the problem: /dev/sda: 62.33 MB/sec /dev/sdb: 67.15 MB/sec My question is: is there a version of this patch that would work with 2.6.13.3 kernel? Are there any plans on fixing this issue in the current kernel (or is this a very unique problem)? I appreciate any help. Thank You. Artur Kedzierski.
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