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kern/55063: kernel iscsi is flaky
>Synopsis: kernel iscsi is flaky
>Arrival-Date: Wed Mar 11 13:15:00 +0000 2020
>Originator: Tobias Nygren
Using the kernel scsi initiator against iscsi-target with 4kB block size I frequently run into some sort of resource limit:
sd0: QUEUE FULL resulted in 0 openings
At first the messages are occasional but then it starts spamming and
the kernel hard hangs after a few minutes. Cannot enter ddb at this point.
host 1: run /usr/sbin/iscsi-target -b 4096
host 2: run iscsid(8), newfs /dev/dk0 with "-O2 -f 4096 -b 32768" and mount with -o log,noatime,nodevtime. Apply moderate I/O like untar or anoncvs checkout for 2-3 minutes.
Tried bumping CCBS_PER_SESSION, CCBS_FOR_SCSIPI, PDUS_PER_CONNECTION but it didn't help.
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