blktests throtl/001 failure due to `scsi_debug` delay=1 by default

[gitPo1son]

this issue happened on aarch64 platform,

throtl/001 failed on the sdebug device , because the default delay=1

parm:           delay:response delay (def=1 jiffy); 0:imm, -1,-2:tiny (int)

of the scsi_debug module caused an additional delay of approximately 2.5 seconds for 256 IO operations,
making the expected 1 second test actually take 3 seconds,

# ./check throtl/001
throtl/001 (nullb) (basic functionality)                     [passed]
    runtime    ...  5.122s
throtl/001 (sdebug) (basic functionality)                    [failed]
    runtime    ...  13.007s
    --- tests/throtl/001.out    2025-11-28 03:05:30.753102288 -0500
    +++ /root/blktests/results/nodev_sdebug/throtl/001.out.bad  2025-11-28 03:06:43.893531846 -0500
    @@ -1,6 +1,6 @@
     Running throtl/001
    -1
    -1
    -1
    -1
    +3
    +3
    ...
    (Run 'diff -u tests/throtl/001.out /root/blktests/results/nodev_sdebug/throtl/001.out.bad' to see the entire diff)

# cat /root/blktests/results/nodev_sdebug/throtl/001.out.bad
Running throtl/001
3
3
3
3
Test complete

# diff -u tests/throtl/001.out /root/blktests/results/nodev_sdebug/throtl/001.out.bad
--- tests/throtl/001.out        2025-11-28 03:05:30.753102288 -0500
+++ /root/blktests/results/nodev_sdebug/throtl/001.out.bad      2025-11-28 03:06:43.893531846 -0500
@@ -1,6 +1,6 @@
 Running throtl/001
-1
-1
-1
-1
+3
+3
+3
+3
 Test complete
# 

[gitPo1son]

add delay=0 can fix this issue, #221

$git diff
diff --git a/tests/throtl/rc b/tests/throtl/rc
index d1afefd..7e7a559 100644
--- a/tests/throtl/rc
+++ b/tests/throtl/rc
@@ -75,7 +75,7 @@ _configure_throtl_blkdev() {
                fi
                ;;
        sdebug)
-               args=(dev_size_mb=1024)
+               args=(dev_size_mb=1024 delay=0)
                ((sector_size)) && args+=(sector_size="${sector_size}")
                if _configure_scsi_debug "${args[@]}"; then
                        THROTL_DEV=${SCSI_DEBUG_DEVICES[0]}

# ./check throtl/001
throtl/001 (nullb) (basic functionality)                     [passed]
    runtime  5.122s  ...  5.113s
throtl/001 (sdebug) (basic functionality)                    [passed]
    runtime  13.007s  ...  5.988s
#