Re: Poor disk IO on Xenserver 6.2
Roger Pau Monné writes: > FreeBSD was able to deliver >3iops in all cases, and the throughput > was around 1000MB/s for all test cases also. On the other hand, Linux > was only able to deliver around 1iops, with a throughput of > ~400MB/s. This was tested using xen-unstable and a Linux v3.15 Dom0. > > Could you try to run this benchmark on both your FreeBSD and Linux > guests? Please make sure guests are set to use the same amount of > RAM/CPUs. Sorry for late reply. I have installed today new beta version of Xenserver from 2014-09-05 XenServer release 6.4.96-88161c (xenenterprise) uname -a 3.10.0+2 #1 SMP Thu Sep 4 12:04:32 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux Didn't have time to learn fio program so I did simple test with copy-paste. Again on Debian 7.6.0 stable files have been copied at 300MB/s speed while FreeBSD 10 release had 25MB/s. I just did: cp some-big-file file1-test and I measured the time from start to finish. Both hosts have the same amount of RAM, DISK and CPUs. I also tested this on 3 different servers. HP ML330, HP DL160 and old Sun X2200. The results are the same. -- Marko Lerota Sent from my GNU Emacs/Gnus Mailer ___ freebsd-xen@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"
Re: Poor disk IO on Xenserver 6.2
El 30/08/14 a les 2.13, Marko Lerota ha escrit: > Roger Pau Monné writes: > >> El 29/08/14 a les 11.16, Marko Lerota ha escrit: >>> I have installed FreeBSD 10 release, stable and current on >>> Xenserver 6.2 with latest patches. All of them have poor disk >>> write speed. Performance from 12MBps - 25MBps. I tried it on >>> other servers but the performance is the same. Latest Debian >>> stable on the same machine have 300MBps disk speed. Am I missing >>> something after installation or this is the default speed? >>> >> >> I've certainly seen higher speeds, around 25-35MB/s on my box, which is >> the same speed I can get with a Linux guest. Could you describe how you >> are running your tests? > > You copy some *.tar.gz or *.iso file that have 600 MB. If it finish > in 2-3 seconds than it's fine. If it runs 40 seconds than it's very, > very bad. You can see current disk speed with 'iostat 1'. Today I have > installed FreeBSD 10-Release on KVM and it runs smooth. Files are > copied at 150-300MB per second. That's how it should be. Suppose that > you need to copy or sync files with another disk/partition very often. > It would be very painful and long process. There is definitely something > wrong here. I've just did some _very_ simple disk benchmarks using fio on both Linux and FreeBSD using a 1GB ramdisk as the backend: 'phy:/dev/ram0,hdd,w' This was added to the guests, both have 1GB of RAM and 8vcpus. Then I've used the following fio workload: [global] rw=write # or read for the read tests size=900m bs=32k direct=1 # tested both 0 and 1 [job1] FreeBSD was able to deliver >3iops in all cases, and the throughput was around 1000MB/s for all test cases also. On the other hand, Linux was only able to deliver around 1iops, with a throughput of ~400MB/s. This was tested using xen-unstable and a Linux v3.15 Dom0. Could you try to run this benchmark on both your FreeBSD and Linux guests? Please make sure guests are set to use the same amount of RAM/CPUs. Roger. ___ freebsd-xen@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"
Re: Poor disk IO on Xenserver 6.2
Roger Pau Monné writes: > El 29/08/14 a les 11.16, Marko Lerota ha escrit: >> I have installed FreeBSD 10 release, stable and current on >> Xenserver 6.2 with latest patches. All of them have poor disk >> write speed. Performance from 12MBps - 25MBps. I tried it on >> other servers but the performance is the same. Latest Debian >> stable on the same machine have 300MBps disk speed. Am I missing >> something after installation or this is the default speed? >> > > I've certainly seen higher speeds, around 25-35MB/s on my box, which is > the same speed I can get with a Linux guest. Could you describe how you > are running your tests? You copy some *.tar.gz or *.iso file that have 600 MB. If it finish in 2-3 seconds than it's fine. If it runs 40 seconds than it's very, very bad. You can see current disk speed with 'iostat 1'. Today I have installed FreeBSD 10-Release on KVM and it runs smooth. Files are copied at 150-300MB per second. That's how it should be. Suppose that you need to copy or sync files with another disk/partition very often. It would be very painful and long process. There is definitely something wrong here. -- Marko Lerota Sent from my GNU Emacs/Gnus Mailer ___ freebsd-xen@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"
Re: Poor disk IO on Xenserver 6.2
El 29/08/14 a les 11.16, Marko Lerota ha escrit: > I have installed FreeBSD 10 release, stable and current on > Xenserver 6.2 with latest patches. All of them have poor disk > write speed. Performance from 12MBps - 25MBps. I tried it on > other servers but the performance is the same. Latest Debian > stable on the same machine have 300MBps disk speed. Am I missing > something after installation or this is the default speed? > I've certainly seen higher speeds, around 25-35MB/s on my box, which is the same speed I can get with a Linux guest. Could you describe how you are running your tests? Roger. ___ freebsd-xen@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"
