linux-kernel - Re: [PATCH 1/1] ib_srp: Infiniband srp fast failover patch.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FC544FE.3000204@sgi.com>
Date:	Tue, 29 May 2012 14:51:58 -0700
From:	Michael Reed <mdr@....com>
To:	Karandeep Chahal <kchahal@....com>
CC:	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	dillowda@...l.gov, roland@...nel.org, sean.hefty@...el.com
Subject: Re: [PATCH 1/1] ib_srp: Infiniband srp fast failover patch.

Did you subsequently reconnect the target and confirm appropriate behavior?


On 05/29/2012 02:07 PM, Karandeep Chahal wrote:
> Subject: [PATCH] Infiniband srp fast failover patch. Currently ib_srp does
>    not do anything on receiving a DREQ from the target, it
>    only sends a response back. Further it also does not
>    monitor port (down) events. I have patched srp to remove
>    scsi devices when a port down event is received or if the
>    target sends a DREQ. Currently even though the target
>    notifies the initiator of its intentions of going away, the
>    initiator ignores that information. Later the initiator
>    gets upset when the devices "suddenly" disappear resulting
>    in srp initiating an error recovery process which takes a
>    long time. This caused high failover latencies as compared
>    to fibre channel. In my experiments with RHEL 6.0 and 6.2 I
>    encountered failover time that exceeded 2 minutes and 20
>    seconds (despite tweaking /etc/multipath.conf and
>    /sys/block/<>/timeout). With this patch the failover takes
>    30 seconds. I have tested this patch with and without a
>    switch.
>
> Yours, etc.
> Karan
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/