https://bugzilla.kernel.org/show_bug.cgi?id=66611 Bug ID: 66611 Summary: Very Slow I/O performance on SAS1064 Product: IO/Storage Version: 2.5 Kernel Version: 3.12.2 Hardware: Sparc64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: SCSI Assignee: linux-scsi@xxxxxxxxxxxxxxx Reporter: mar@xxxxxxx Regression: No Hi I have a sunfire v245 with 4 Sata disks (TOSHIBA MQ01ABB2 0U) my controller: 0000:0d:01.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1064 PCI-X Fusion-MPT SAS (rev 02) [ 86.909571] Fusion MPT SAS Host driver 3.04.20 Moduls load: mptsas 33574 2 scsi_transport_sas 21704 2 mptsas mptscsih 17605 1 mptsas mptbase 53658 3 mptctl,mptsas,mptscsih scsi_mod 171548 10 sg,scsi_transport_sas,libata,mptctl,mptsas,sd_mod,sr_mod,mptscsih The kernel is self compiled and i provide the config if needed Linux hostname 3.12.2 #4 Wed Dec 4 13:45:28 CET 2013 sparc64 GNU/Linux On Debian 7.2 Test with dd: # dd if=/dev/zero of=test.dd bs=8k count=1000 1000+0 records in 1000+0 records out 8192000 bytes (8.2 MB) copied, 85.015 s, 96.4 kB/s # dstat -cdr -D sdb ----total-cpu-usage---- --dsk/sdb-- ---io/sdb-- usr sys idl wai hiq siq| read writ| read writ 11 1 36 52 0 0| 93k 5949B|0.58 0.96 0 0 0 100 0 0| 0 25k| 0 3.00 0 0 0 100 0 0| 0 225k| 0 37.0 0 0 0 100 0 0| 0 528k| 0 68.0 0 0 0 100 0 0| 0 224k| 0 29.0 0 0 0 100 0 0| 0 130k| 0 16.0 0 0 0 100 0 0| 0 0 | 0 0 0 0 0 100 0 0| 0 8192B| 0 1.00 0 0 0 100 0 0| 0 25k| 0 4.00 0 0 0 100 0 0| 0 85k| 0 16.0 0 0 0 100 0 0| 0 87k| 0 11.0 0 0 0 100 0 0| 0 0 | 0 0 0 0 0 100 0 0| 0 8192B| 0 1.00 0 0 0 100 0 0| 0 25k| 0 4.00 0 0 0 100 0 0| 0 26k| 0 5.00 .... Thanks -- You are receiving this mail because: You are the assignee for the bug. -- 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
