From owner-freebsd-scsi@FreeBSD.ORG Tue Feb 5 21:18:39 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 58B01DAE; Tue, 5 Feb 2013 21:18:39 +0000 (UTC) (envelope-from ken@kdm.org) Received: from nargothrond.kdm.org (nargothrond.kdm.org [70.56.43.81]) by mx1.freebsd.org (Postfix) with ESMTP id 161578BB; Tue, 5 Feb 2013 21:18:38 +0000 (UTC) Received: from nargothrond.kdm.org (localhost [127.0.0.1]) by nargothrond.kdm.org (8.14.2/8.14.2) with ESMTP id r15LGhCO075656; Tue, 5 Feb 2013 14:16:43 -0700 (MST) (envelope-from ken@nargothrond.kdm.org) Received: (from ken@localhost) by nargothrond.kdm.org (8.14.2/8.14.2/Submit) id r15LGgLf075655; Tue, 5 Feb 2013 14:16:42 -0700 (MST) (envelope-from ken) Date: Tue, 5 Feb 2013 14:16:42 -0700 From: "Kenneth D. Merry" To: "Desai, Kashyap" Subject: Re: Max Queue depth of HBA limited to 256 ? Message-ID: <20130205211642.GA75343@nargothrond.kdm.org> References: <20130121170529.GA64188@nargothrond.kdm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2i Cc: "freebsd-scsi@freebsd.org" , "McConnell, Stephen" , "jhb@freebsd.org" 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: Tue, 05 Feb 2013 21:18:39 -0000 I'm able to get more than 255 commands outstanding to the controller in my configuration. For example: dev.mps.0.%desc: LSI SAS2116 dev.mps.0.%driver: mps dev.mps.0.%location: slot=6 function=0 handle=\_SB_.PCI0.S30_ dev.mps.0.%pnpinfo: vendor=0x1000 device=0x0064 subvendor=0x1000 subdevice=0x30c0 class=0x010700 dev.mps.0.%parent: pci0 dev.mps.0.debug_level: 4 dev.mps.0.disable_msix: 0 dev.mps.0.disable_msi: 0 dev.mps.0.firmware_version: 13.00.01.00 dev.mps.0.driver_version: 14.00.00.01-fbsd dev.mps.0.io_cmds_active: 442 dev.mps.0.io_cmds_highwater: 464 dev.mps.0.chain_free: 354 dev.mps.0.chain_free_lowwater: 181 dev.mps.0.max_chains: 2048 dev.mps.0.chain_alloc_fail: 0 io_cmds_highwater is 464. Can you get more than 255 commands outstanding if you use more than 1 target? This is with 272 'dd' processes doing 1MB reads to 16 2TB and 3TB SAS drives behind 2 3Gb Maxim expanders: at scbus2 target 144 lun 0 (pass4,sg4,da0) at scbus2 target 145 lun 0 (pass5,sg5,da1) at scbus2 target 146 lun 0 (pass6,sg6,da2) at scbus2 target 147 lun 0 (pass7,sg7,da3) at scbus2 target 148 lun 0 (pass8,sg8,da4) at scbus2 target 149 lun 0 (pass9,sg9,da5) at scbus2 target 150 lun 0 (pass10,sg10,da6) at scbus2 target 151 lun 0 (pass11,sg11,da7) at scbus2 target 152 lun 0 (pass12,sg12,da8) at scbus2 target 153 lun 0 (pass13,sg13,da9) at scbus2 target 154 lun 0 (pass14,sg14,da10) at scbus2 target 155 lun 0 (pass15,sg15,da11) at scbus2 target 156 lun 0 (pass16,sg16,da12) at scbus2 target 157 lun 0 (pass17,sg17,da13) at scbus2 target 158 lun 0 (pass18,sg18,da14) at scbus2 target 159 lun 0 (pass19,sg19,da15) i.e. 17 iterations of this: ((i=0)); while [ $i -le 15 ]; do dd if=/dev/da$i of=/dev/null bs=1m & ((i++)); done The individual drives see varying numbers of tags, but nowhere near the maximum: [root@storage-domain ~]# camcontrol tags da15 -v (pass19:mps0:0:159:0): dev_openings 230 (pass19:mps0:0:159:0): dev_active 25 (pass19:mps0:0:159:0): devq_openings 230 (pass19:mps0:0:159:0): devq_queued 0 (pass19:mps0:0:159:0): held 0 (pass19:mps0:0:159:0): mintags 2 (pass19:mps0:0:159:0): maxtags 255 What kind of drive is the target? Ken On Wed, Jan 23, 2013 at 00:44:31 +0530, Desai, Kashyap wrote: > LSI h/w needs more outstanding command in FW to get better Perf counts compare to other OS. > > Please suggest if whatever I have been observed is limitation from FreeBSD or we can tune it in Driver ? > My goals is to pump ~1000 outstanding IOs to the HBA. I see that it never goes beyond 255. > > Thanks, > Kashyap > > > -----Original Message----- > > From: owner-freebsd-scsi@freebsd.org [mailto:owner-freebsd- > > scsi@freebsd.org] On Behalf Of Desai, Kashyap > > Sent: Monday, January 21, 2013 11:18 PM > > To: Kenneth D. Merry > > Cc: freebsd-scsi@freebsd.org; jhb@freebsd.org; McConnell, Stephen > > Subject: RE: Max Queue depth of HBA limited to 256 ? > > > > > > > > > -----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 ? > > > > > > 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 ? > > > > > > > > > > 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(): > > > > > > sc->num_reqs = MIN(MPS_REQ_FRAMES, sc->facts->RequestCredit); > > > > > > What is reported for the RequestCredit on this particular adapter? > > > > > > 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. > > Similar to "RequestCredit".. Different FW has different value, but they > > are every time above 255. > > > > > > When I run IOs dev_active stays in range of 0-255 only. See below > > output when I run IOs on /dev/da1 and /dev/da13. I expect total > > dev_openings should go beyond 255, which is not happening. > > > > > > 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" = 1024 > > > > sc->sim_0 = cam_sim_alloc(mrsas_action, mrsas_poll, "mrsas", sc, > > device_get_unit(sc->mrsas_dev), &sc->sim_lock, queue_depth, > > queue_depth, devq); > > > > ~ Kashyap > > > > > > > > Ken > > > -- > > > Kenneth Merry > > > ken@FreeBSD.ORG > > _______________________________________________ > > freebsd-scsi@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-scsi > > To unsubscribe, send any mail to "freebsd-scsi-unsubscribe@freebsd.org" -- Kenneth Merry ken@FreeBSD.ORG