[ofa-general] SRP/mlx4 interrupts throttling performance

[Cameron Harr]

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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