From owner-freebsd-scsi@FreeBSD.ORG Mon Jan 21 17:49:46 2013 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id 55BC570C; Mon, 21 Jan 2013 17:49:46 +0000 (UTC) (envelope-from Kashyap.Desai@lsi.com) Received: from na3sys009aog101.obsmtp.com (na3sys009aog101.obsmtp.com [74.125.149.67]) by mx1.freebsd.org (Postfix) with ESMTP id B3DFE1EE; Mon, 21 Jan 2013 17:49:45 +0000 (UTC) Received: from paledge01.lsi.com ([192.19.193.42]) (using TLSv1) by na3sys009aob101.postini.com ([74.125.148.12]) with SMTP ID DSNKUP1/s5yURRJ2/0o5zYHfzrZKcT6P0e1g@postini.com; Mon, 21 Jan 2013 09:49:46 PST Received: from PALCAS01.lsi.com (128.94.213.117) by PALEDGE01.lsi.com (192.19.193.42) with Microsoft SMTP Server (TLS) id 8.3.264.0; Mon, 21 Jan 2013 12:48:27 -0500 Received: from inbexch01.lsi.com (135.36.98.37) by PALCAS01.lsi.com (128.94.213.117) with Microsoft SMTP Server (TLS) id 8.3.264.0; Mon, 21 Jan 2013 12:48:29 -0500 Received: from inbmail01.lsi.com ([135.36.98.64]) by inbexch01.lsi.com ([135.36.98.37]) with mapi; Mon, 21 Jan 2013 23:18:26 +0530 From: "Desai, Kashyap" To: "Kenneth D. Merry" Date: Mon, 21 Jan 2013 23:18:24 +0530 Subject: RE: Max Queue depth of HBA limited to 256 ? Thread-Topic: Max Queue depth of HBA limited to 256 ? Thread-Index: Ac33+YtDXsJz1U+4Ry62mJByV4SrKgABRkhg Message-ID: References: <20130121170529.GA64188@nargothrond.kdm.org> In-Reply-To: <20130121170529.GA64188@nargothrond.kdm.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "freebsd-scsi@freebsd.org" , "jhb@freebsd.org" , "McConnell, Stephen" X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jan 2013 17:49:46 -0000 > -----Original Message----- > From: Kenneth D. Merry [mailto:ken@freebsd.org] > Sent: Monday, January 21, 2013 10:35 PM > To: Desai, Kashyap > Cc: freebsd-scsi@freebsd.org; McConnell, Stephen; Saxena, Sumit; > jhb@freebsd.org > Subject: Re: Max Queue depth of HBA limited to 256 ? >=20 > On Mon, Jan 21, 2013 at 20:15:47 +0530, Desai, Kashyap wrote: > > Hi, > > > > I was trying to check few things on LSI controller, where we have more > than 256 queue depth support. > > I added default maxtags in scsi/scsi_xpt.c as below. (Because I don't > want mattags to restrict any outstanding commands the LSI HBA. > > > > { > > /* Default tagged queuing parameters for all devices */ > > { > > T_ANY, SIP_MEDIA_REMOVABLE|SIP_MEDIA_FIXED, > > /*vendor*/"*", /*product*/"*", /*revision*/"*" > > }, > > /*quirks*/0, /*mintags*/2, /*maxtags*/1024 <--- Default > maxtags were 256. I increase it to 10234 > > }, > > > > > > LSI's SAS-HBA and MR-HBA can support more than 256 outstanding > commands in Firmware. But due to some reason, I am not able to pump > more than 256 outstanding commands to the HBA. > > > > I used "rawio -p 256 /dev/da1" and more /dev/dax in loop. I have > sysctl parameter in Driver to display outstanding "FW commands". Max > value for FW outstanding only goes up to 256. > > > > Also from some other mail thread Subject "mfi driver performance", I > found that folks talk about tuning queue depth _but_ nobody discussed to > increase it beyond 256. Is there any limitation in FreeBSD ? > > >=20 > As Jim pointed out, one thing to check is the values passed into > cam_sim_alloc(). In the case of the mps(4) driver, the calculation is > in mps_attach(): >=20 > sc->num_reqs =3D MIN(MPS_REQ_FRAMES, sc->facts->RequestCredit); >=20 > What is reported for the RequestCredit on this particular adapter? >=20 > The other question is, what does 'camcontrol tags daX -v' show when you > are running the test? Below is output of camcontrol tags da1 -v. dhcp-135-24-192-127# camcontrol tags da13 -v (pass13:mrsas0:0:13:0): dev_openings 1024 (pass13:mrsas0:0:13:0): dev_active 0 (pass13:mrsas0:0:13:0): devq_openings 1024 (pass13:mrsas0:0:13:0): devq_queued 0 (pass13:mrsas0:0:13:0): held 0 (pass13:mrsas0:0:13:0): mintags 2 (pass13:mrsas0:0:13:0): maxtags 1024 dhcp-135-24-192-127# camcontrol tags da1 -v (pass1:mrsas0:0:1:0): dev_openings 1024 (pass1:mrsas0:0:1:0): dev_active 0 (pass1:mrsas0:0:1:0): devq_openings 1024 (pass1:mrsas0:0:1:0): devq_queued 0 (pass1:mrsas0:0:1:0): held 0 (pass1:mrsas0:0:1:0): mintags 2 (pass1:mrsas0:0:1:0): maxtags 1024 Value 1024 is hard coded for my testing. In MegaRaid controller and SAS-HBA= Driver read max commands value from FW.=20 Similar to "RequestCredit".. Different FW has different value, but they ar= e every time above 255. When I run IOs dev_active stays in range of 0-255 only. See below output w= hen I run IOs on /dev/da1 and /dev/da13. I expect total dev_openings should= go beyond 255, which is not happening. =20 dhcp-135-24-192-127# camcontrol tags da1 -v (pass1:mrsas0:0:1:0): dev_openings 832 (pass1:mrsas0:0:1:0): dev_active 192 (pass1:mrsas0:0:1:0): devq_openings 832 (pass1:mrsas0:0:1:0): devq_queued 0 (pass1:mrsas0:0:1:0): held 0 (pass1:mrsas0:0:1:0): mintags 2 (pass1:mrsas0:0:1:0): maxtags 1024 dhcp-135-24-192-127# camcontrol tags da13 -v (pass13:mrsas0:0:13:0): dev_openings 881 (pass13:mrsas0:0:13:0): dev_active 143 (pass13:mrsas0:0:13:0): devq_openings 881 (pass13:mrsas0:0:13:0): devq_queued 0 (pass13:mrsas0:0:13:0): held 0 (pass13:mrsas0:0:13:0): mintags 2 (pass13:mrsas0:0:13:0): maxtags 1024 Jim: Below is my API call. I have hard code value "queue_depth" =3D 1024=20 sc->sim_0 =3D cam_sim_alloc(mrsas_action, mrsas_poll, "mrsas", sc, device_get_unit(sc->mrsas_dev), &sc->sim_lock, queue_depth, queue_depth, devq); ~ Kashyap >=20 > Ken > -- > Kenneth Merry > ken@FreeBSD.ORG