I was able to get the latest scst code working with Vu's standalone
ib_srpt and the kernel IB modules, and dropped my ib_srpt thread count
to 2. However, I still get about the same IOP performance on the target
although interrupts on the "busy" cpu have gone up to around 140K.
Interesting, but now I'm at a bit of a loss as to where the bottleneck
could be. I figured it was Interrupts, but if the CPU is handling more
right now, perhaps the problem is elsewhere?
Cameron
Cameron Harr wrote:
Cameron Harr wrote:
Additionally, I found that I can load the newer scst code if I use
the kernel-supplied modules and the standalone srpt-1.0.0 package
that I think you provide Vu. I was about to try it along with
dropping a module param for ib_srpt (I was using a thread count of 32
that had given me better performance on an earlier test). I'll report
back on this.
Not much luck using the newer scst code and default kernel modules
(Running CentOS 5.2). If I try using the default kernel modules on the
initiator, I can't get them to see anything (the ofed SM pkg doesn't
see any devices to run on). When using the regular OFED on the
initiator, my target dies when I try to attach to the target on the
initiator:
---------------------------------
ib_srpt: Host login i_port_id=0x0:0x2c90300026053
t_port_id=0x2c90300026046:0x2c90300026046 it_iu_len=996
Oct 3 13:44:23 test05 kernel: i[4127]: scst:
scst_mgmt_thread:5187:***CRITICAL ERROR*** session ffff8107f3222b88 is
in scst_sess_shut_list, but in unknown shut phase 0
BUG at /usr/src/scst.tot/src/scst_targ.c:5188
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at /usr/src/scst.tot/src/scst_targ.c:5188
invalid opcode: 0000 [1] SMP
last sysfs file: /devices/pci0000:00/0000:00:00.0/class
CPU 2
Modules linked in: ib_srpt(U) ib_cm ib_sa scst_vdisk(U) scst(U)
fio_driver(PU) fio_port(PU) mlx4_ib ib_mad ib_core ipv6 xfrm_nalgo
crypto_api autofs4 hidp rfcomm l2cap bluetooth sunrpc nls_utf8 hfsplus
dm_mirror dm_multipath dm_mod video sbs backlight i2c_ec button
battery asus_acpi acpi_memhotplug ac parport_pc lp parport i2c_i801
i5000_edac i2c_core edac_mc pcspkr shpchp mlx4_core e1000e ata_piix
libata sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 4127, comm: scsi_tgt_mgmt Tainted: P 2.6.18-92.1.13.el5 #1
RIP: 0010:[<ffffffff88488a56>] [<ffffffff88488a56>]
:scst:scst_mgmt_thread+0x3ff/0x577
---------------------------------
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