Date: Wed, 28 Oct 2015 20:29:12 +0000 From: "Pokala, Ravi" <rpokala@panasas.com> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: "freebsd-geom@freebsd.org" <freebsd-geom@freebsd.org>, "freebsd-scsi@freebsd.org" <freebsd-scsi@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, "ken@freebsd.org" <ken@freebsd.org>, "imp@freebsd.org" <imp@freebsd.org>, "scottl@freebsd.org" <scottl@freebsd.org> Subject: Re: Low-level trace-buffers in CAM Message-ID: <76951B36-ADA9-45AC-BC20-2A8340DEC6B8@panasas.com> In-Reply-To: <20151028140322.GK6469@zxy.spb.ru> References: <A760883F-317D-46C9-AD7C-B8F5D96A49DA@panasas.com> <20151028140322.GK6469@zxy.spb.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
-----Original Message----- From: Slawa Olhovchenkov <slw@zxy.spb.ru> Date: 2015-10-28, Wednesday at 07:03 To: Ravi Pokala <rpokala@panasas.com> Cc: "freebsd-geom@freebsd.org" <freebsd-geom@freebsd.org>, "freebsd-scsi@freebsd.org" <freebsd-scsi@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, "ken@freebsd.org" <ken@freebsd.org>, "imp@freebsd.org" <imp@freebsd.org>, "scottl@freebsd.org" <scottl@freebsd.org> Subject: Re: Low-level trace-buffers in CAM >On Tue, Oct 27, 2015 at 02:22:33AM +0000, Pokala, Ravi wrote: > >> Hi folks, >> >> ---------------------------------------------------------------- >> This is an updated re-send of a message I originally sent about a year ago, during MeetBSD 2014. A few people expressed interest in person, but no one ever followed up on the lists. I'm bringing this up again, in the hopes that I can get some feedback before / during next week's Dev/Vendor Summit. I'm CCing some folks who expressed interest at that time, and some folks that I was told would be interested. >> ---------------------------------------------------------------- > >What about also export average queue length? May be request wait time in queue. Those are certainly good to have, but are at a higher layer than what I'm trying to capture. I'm really interested in what's going into and out of the hardware - the values of the CDB fields just before they get sent to the hardware, and the elapsed time and return-CDB fields when the SIM driver's interrupt handler fires at command completion. Admittedly, most people don't need that level of detail, but I work for a storage company, so ... ;-) -Ravi
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?76951B36-ADA9-45AC-BC20-2A8340DEC6B8>