[ofa-general] SRP/mlx4 interrupts throttling performance

[Vladislav Bolkhovitin]

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

This can happen if the target driver frees some IO or TM command twice, 
by, eg, calling scst_tgt_cmd_done() two times for the same command.

> 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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