Re: RFC: FMR support in SRP

[Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>]

On 09/19/14 17:08, Jinpu Wang wrote:
> Thank you very much for quick reply. I tried you test program with:
>
> ./discontiguous-io -l 4096 -o 1024 -s -w /dev/sdb
>
> The program just wait there, and strace show it hang at read:
>
> munmap(0x7fb074c10000, 24430)           = 0
> brk(0)                                  = 0x1896000
> brk(0x18b8000)                          = 0x18b8000
> open("/dev/sdb", O_RDONLY)              = 3
> ioctl(3, BLKSSZGET, 0x6066e0)           = 0
> fstat(0, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x7fb074c16000
> read(0,
>
> ib_srp load with cmd_sg_entries=255, target side use ib_srpt from svn
> 1 month ago.
>
> Kernel is 3.14.13
>
> lsscsi
> [0:0:0:0]    disk    ATA      ST3750528AS      CC38  /dev/sda
> [1:0:0:0]    disk    SCST_BIO vol0              310  /dev/sdb
> [1:0:0:1]    disk    SCST_BIO vol1              310  /dev/sdc

Hello Jack,

Did you know that file descriptor 0 corresponds to stdin ? With 
command-line option -w the test program reads data from stdin and sends 
that data to a SCSI device. I think the test program is waiting for you 
to provide input data :-)

Bart.

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