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+
+performance regression in qemu-user + proot
+
+To reproduce:
+
+1. Install qemu-user-static and proot
+2. Enter some arm chroot using them:
+
+    proot -0 -q qemu-arm-static -w / -r chroot/ /bin/bash
+
+3. Run a command which normally takes a short but measurable amount of time:
+
+    cd /usr/share/doc && time grep -R hello
+
+Result:
+
+This is over 100 times slower on 18.04 than it was on 16.04. I am not sure if proot or qemu is causing the problem, but proot version has not changed. Also note that on 16.04 I am using the cloud repo version of qemu, which is newer than 16.04 stock, but still older than 18.04.
+
+Although system 2 is lower spec than system 1, it should not be this much slower. No other software seems to be affected.
+
+If required I can supply a chroot tarball. It is essentially just a Debian bootstrap though.
+
+Logs:
+
+
+
+System 1: i7-6700 3.4GHz, 32GB RAM, 512GB Crucial MX100 SSD, Ubuntu 16.04
+qemu-arm version 2.10.1(Debian 1:2.10+dfsg-0ubuntu3.4~cloud0)
+proot 5.1.0
+
+al@al-desktop:~/rpi-ramdisk/raspbian$ proot -0 -q qemu-arm-static -w / -r root/ /bin/bash
+root@al-desktop:/# cd /usr/share/doc
+root@al-desktop:/usr/share/doc# time grep -R hello
+dash/copyright:Debian GNU/Linux hello source package as the file COPYING.  If not,
+
+real	0m0.066s
+user	0m0.040s
+sys	0m0.008s
+
+
+
+
+
+System 2: i5-5300U 2.30GHz, 8GB RAM, 256GB Crucial MX300 SSD, Ubuntu 18.04
+qemu-arm version 2.11.1(Debian 1:2.11+dfsg-1ubuntu4)
+proot 5.1.0
+
+al@al-thinkpad:~/rpi-ramdisk/raspbian$ proot -0 -q qemu-arm-static -w / -r root/ /bin/bash
+root@al-thinkpad:/# cd /usr/share/doc
+root@al-thinkpad:/usr/share/doc# time grep -R hello
+dash/copyright:Debian GNU/Linux hello source package as the file COPYING.  If not,
+
+real	0m24.176s
+user	0m0.366s
+sys	0m11.352s
+
+ProblemType: Bug
+DistroRelease: Ubuntu 18.04
+Package: qemu (not installed)
+ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
+Uname: Linux 4.15.0-12-generic x86_64
+ApportVersion: 2.20.8-0ubuntu10
+Architecture: amd64
+Date: Mon Mar 19 07:13:25 2018
+InstallationDate: Installed on 2018-03-18 (0 days ago)
+InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180318)
+SourcePackage: qemu
+UpgradeStatus: No upgrade log present (probably fresh install)
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