Dear Eric Moore and all, I am installing ubuntu 9.10 (kernel 2.6.31-14-server) on my PC, which has OCZ Z-Drive p84. This drive consists of LSI logic's SAS1068E controller and 4 MLC SSDs. I am using mptsas driver instead of the official binary driver (megasar). I ran simple read & write benchmark using dd(1). The result shows the throughput of sequential read achieves 260 MB/s, which is the half of sequential write performance (520 MB/s): block size write (MB/s) read (MB/s) 1024 201 241 4096 472 262 16384 486 267 65536 502 266 262144 472 259 524288 525 251 1048576 528 245 2097152 517 253 4194304 433 247 8388608 406 246 16777216 405 243 33554432 405 242 67108864 405 242 I wonder why read performance is worse than write performance. What is the bottleneck of read performance? For more information, please see my page: http://code.google.com/p/pspacer/wiki/ZdrivePerformance Any comments and suggestions will be welcome. Best regards, Ryousei -- To unsubscribe from this list: 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
