Hi, I'm seeing really bad scsi performance with 2.6.14 in combination with Fusion MPT and amd64. The same behavior was seen in 2.6.14-git13. The controller in question identifies itself as "LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 07)", PCI ID 1000:0030. Starting with 2.6.14 (didn't test the releases between 2.6.13 and 2.6.14) the resync rate of the software raid dropped to about 2mb/sec on a raid1 array over two scsi disks (normally I get around 60-80mb/sec), doing a dd from one disk to the other supported those values. I can't give exact measures since a "sync" call hangs since half an hour (was a bit too much data for testing) but vmstat shows: procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 5 0 23873224 8198000 24288 0 0 463 259 71 23 0 0 83 17 0 5 0 23872968 8198000 24288 0 0 0 4096 273 48 0 0 75 25 0 5 0 23873340 8198000 24288 0 0 0 0 271 50 0 0 75 25 0 4 0 23873084 8198000 24288 0 0 0 4096 270 49 0 0 75 24 0 4 0 23873120 8198000 24288 0 0 0 4096 274 54 0 0 75 25 0 4 0 23873120 8198000 24288 0 0 0 0 270 44 0 0 75 25 0 4 0 23873136 8198000 24288 0 0 0 4096 272 51 0 0 75 25 which is bad. Any ideas? best regards, Michael Renner - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
