linux-kernel - Re: [PATCH] scsi: core: Log SCSI command age with errors

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: <f2c97e860f895613ba81b69c962660b0c712723a.camel@suse.de>
Date:   Mon, 30 Sep 2019 10:42:14 +0200
From:   Martin Wilck <mwilck@...e.de>
To:     Laurence Oberman <loberman@...hat.com>,
        "Milan P. Gandhi" <mgandhi@...hat.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Cc:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Subject: Re: [PATCH] scsi: core: Log SCSI command age with errors

On Fri, 2019-09-27 at 13:45 -0400, Laurence Oberman wrote:
> 
> Hi Martin
> 
> Agreed about log extraction, but turning that on with a busy workload
> in a production environment is not practical. We cant do it with
> systems with 1000's of luns and 1000's of IOPS/sec.
> Also second resolution is good enough for the debug we want to see.

I gather that you look at a specific problem where second resolution is
sufficient. For upstream, the generic usefulness should be considered,
and I don't think we can say today that better-than-second resolution
will never be useful, so I still vote for milliseconds.

Wrt the enablement of the option on highly loaded systems, I'm not sure
I understand. You need to enable SCSI logging anyway, don't you? Is it
an issue to have to set 2 sysfs values rather than just one?

Regards,
Martin

> 
> Regards
> Laurence
>