Bug 66611

Summary:	Very Slow I/O performance on SAS1064
Product:	IO/Storage	Reporter:	Markus (mar)
Component:	SCSI	Assignee:	linux-scsi (linux-scsi)
Status:	NEW ---
Severity:	normal	CC:	szg00000
Priority:	P1
Hardware:	Sparc64
OS:	Linux
Kernel Version:	3.12.2	Subsystem:
Regression:	No	Bisected commit-id:

Description Markus 2013-12-05 14:23:29 UTC

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

Comment 1 Markus 2013-12-05 17:36:07 UTC

I forgot to tell that there were normaly SAS storages attacht which perfom well. So its a combination between my Sata storages and the Lsi controller.

Comment 2 Markus 2013-12-06 12:48:41 UTC

[76030.662354] sd 2:0:0:0: [sda] CDB:
[76030.708275] Synchronize Cache(10): 35 00 00 00 00 00 00 00 00 00
[76032.423998] mptscsih: ioc0: task abort: SUCCESS (rv=2002) (sc=fffff8137f45fda0)
[76132.695517] mptscsih: ioc0: attempting task abort! (sc=fffff8137f4049a0)

Comment 3 Szőgyényi Gábor 2016-11-09 19:40:58 UTC

Please try this bug with latest kernel image.