Date: Wed, 17 Aug 2016 10:19:05 +0200 From: rainer@ultra-secure.de To: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com> Cc: freebsd-xen@freebsd.org, owner-freebsd-xen@freebsd.org Subject: Re: Is it me or is FreeBSD slower on Xen than Linux? Message-ID: <599395934f751784b1f842ed3c8f879c@ultra-secure.de> In-Reply-To: <cff064d12c783cc6eebba4b56f063ba7@ultra-secure.de> References: <2a0a5ae2821551935de329b8665834be@ultra-secure.de> <20160816100605.la63x2ju5bmtdqhl@mac> <e62d4e94ec36fa859783ddc0aeb1aa28@ultra-secure.de> <20160816110759.6xlvxikw3tziahfd@mac> <c3a3a7da26cd1a6a114c03e823926272@ultra-secure.de> <20160816132938.d2i4u2y3scpzi2et@mac> <00D22384-BAA7-42E4-A486-4BE07562D011@sarenet.es> <8521aebaa093bcefe5956a71fd879140@ultra-secure.de> <872C5626-F58D-4F84-92AC-88B7352D1DDF@sarenet.es> <c6bdef83f2370173c067820565bf933e@ultra-secure.de> <20160816141826.56mxsgx6e7rynxqg@mac> <cff064d12c783cc6eebba4b56f063ba7@ultra-secure.de>
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Am 2016-08-16 16:24, schrieb rainer@ultra-secure.de: > Am 2016-08-16 16:18, schrieb Roger Pau Monné: > >> I'm not saying it's not possible, but are you sure this slowdown is >> caused >> by the disk? It's certainly a possibility, but I would like to make >> sure >> it's caused by that before jumping into conclusions. >> >> Can you load the full database in RAM and perform the same test. TBH, >> I >> don't use MariaDB, so I'm not sure what's the best way to achieve >> this, but >> a quick search on google shows there are multiple ways. In any case, >> make >> sure with iostat that the database is not read from the disk. > > I'll try to do some disk-benchmarks, when I can attach some bigger > disks. on Ubuntu 14 with HVM: dc3dd wipe=/dev/xvdc dc3dd 7.1.614 started at 2016-08-17 09:38:17 +0200 compiled options: command line: dc3dd wipe=/dev/xvdc device size: 104857600 sectors (probed) sector size: 512 bytes (probed) 53687091200 bytes (50 G) copied (100%), 464.642 s, 110 M/s input results for pattern `00': 104857600 sectors in output results for device `/dev/xvdc': 104857600 sectors out dc3dd completed at 2016-08-17 09:46:01 +0200 On FreeBSD 10.3-RELEASE-p6 with HVM: Aug 17 09:57:52 bla-prod kernel: xbd4: 51200MB <Virtual Block Device> at device/vbd/51776 on xenbusb_front0 Aug 17 09:57:52 bla-prod kernel: xbd4: features: write_barrier Aug 17 09:57:52 bla-prod kernel: xbd4: synchronize cache commands enabled. dc3dd wipe=/dev/xbd4 and it's showing 8.something MB/s Is this normal? What may I be doing wrong? Rainer
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