On Tue, Jun 20, 2017 at 11:19 AM, Sagi Grimberg [off-list ref] wrote:

quoted

Testing this patch I didn't see these new messages even when rebooting
the targets multiple times. It also resolved some performance problems
I was seeing (I think our switches are having bugs with IPv6 and
routing) and I was receiving expected performance. At one point in the
test, one target (4.9.33) showed:
[Tue Jun 20 10:11:20 2017] iSCSI Login timeout on Network Portal [::]:3260
[Tue Jun 20 10:11:39 2017] iSCSI Login timeout on Network Portal [::]:3260
[Tue Jun 20 10:11:58 2017] isert: isert_print_wc: login send failure:
transport retry counter exceeded (12) vend_err 81

I don't understand, is this new with the patch applied?

I applied your patch to 4.12-rc6 on the initiator, but my targets are
still 4.9.33 since it looked like the patch only affected the
initiator. I did not see this before your patch, but I also didn't try
rebooting the targets multiple times before because of the previous
messages.

quoted

After this and a reboot of the target, the initiator would drop the
connection after 1.5-2 minutes then faster and faster until it was
every 5 seconds. It is almost like it set up the connection then lose
the first ping, or the ping wasn't set-up right. I tried rebooting the
target multiple times.

So the initiator could not recover even after the target as available
again?

The initiator recovered the connection when the target came back, but
the connection was not stable. I/O would happen on the connection,
then it would get shaky and then finally disconnect. Then it would
reconnect, pass more I/O, then get shaky and go down again. With the 5
second disconnects, it would pass traffic for 5 seconds, then as soon
as I saw the ping timeout, the I/O would stop until it reconnected. At
that point it seems that the lack of pings would kill the I/O unlike
earlier where there was a stall in I/O and then the connection would
be torn down. I can try to see if I can get it to happen again.

----------------
Robert LeBlanc
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