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Re: Why is Qemu slow?


From: Narcis Garcia
Subject: Re: Why is Qemu slow?
Date: Wed, 24 Aug 2022 15:48:26 +0200

Please, provide the output of following 2 commands:

cat /proc/cpuinfo | grep -wie "^flags" | grep -woie "svm" -woie "vmx"

lsmod | tr -s '\t' ' ' | grep -ie '^kvm_' -ie '^kvm '


El 24/8/22 a les 15:31, pviltard@free.fr ha escrit:
Hello,

First of all bravo Qemu has progressed and I have lots of questions.

Configuration :

DELL precision 690
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz  *2
MemTotal:       64571604 kB
root@jonas:/proc# lsblk --scsi
NAME HCTL       TYPE VENDOR   MODEL                    REV TRAN
sda  2:0:0:0    disk ATA      ST2000DM001-1ER1        CC43 sata
sr0  3:0:0:0    rom  HL-DT-ST HL-DT-ST_BD-RE_BH16NS40 1.01 sata

root@jonas:/proc# uname -a
Linux jonas 5.4.0-124-generic #140-Ubuntu SMP Thu Aug 4 02:23:37 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
qemu-7.1.0-rc2/build/qemu-system-ppc64

./configure
..
     default devices              : YES
     out of process emulation     : YES
     vfio-user server             : NO

   Block layer support
     coroutine backend            : ucontext
     coroutine pool               : YES
     Block whitelist (rw)         :
     Block whitelist (ro)         :
     Use block whitelist in tools : NO
     VirtFS support               : YES
     build virtiofs daemon        : YES
     Live block migration         : YES
     replication support          : YES
     bochs support                : YES
     cloop support                : YES
     dmg support                  : YES
     qcow v1 support              : YES
     vdi support                  : YES
     vvfat support                : YES
     qed support                  : YES
     parallels support            : YES
     FUSE exports                 : NO
     VDUSE block exports          : YES

   Crypto
     TLS priority                 : NORMAL
     GNUTLS support               : YES 3.6.13
       GNUTLS crypto              : NO
     libgcrypt                    : YES 1.8.5
     nettle                       : NO
     AF_ALG support               : NO
     rng-none                     : NO
     Linux keyring                : YES

   Dependencies
     SDL support                  : YES
     SDL image support            : NO
     GTK support                  : YES
     pixman                       : YES 0.38.4
     VTE support                  : YES 0.60.3
     slirp support                : internal
     libtasn1                     : YES 4.16.0
     PAM                          : NO
     iconv support                : YES
     curses support               : YES
     virgl support                : NO
     curl support                 : YES 7.68.0
     Multipath support            : YES
     PNG support                  : YES 1.6.37
     VNC support                  : YES
     VNC SASL support             : YES
     VNC JPEG support             : YES 2.0.3
     OSS support                  : YES
     ALSA support                 : YES 1.2.2
     PulseAudio support           : YES 13.99.1
     JACK support                 : NO
     brlapi support               : YES
     vde support                  : YES
     netmap support               : NO
     l2tpv3 support               : YES
     Linux AIO support            : YES
     Linux io_uring support       : NO
     ATTR/XATTR support           : YES
     RDMA support                 : NO
     PVRDMA support               : NO
     fdt support                  : system
     libcap-ng support            : YES
     bpf support                  : NO
     spice protocol support       : NO
     rbd support                  : YES
     smartcard support            : NO
     U2F support                  : NO
     libusb                       : NO
     usb net redir                : NO
     OpenGL support (epoxy)       : YES 1.5.4
     GBM                          : NO
     libiscsi support             : YES 1.18.0
     libnfs support               : YES 4.0.0
     seccomp support              : YES 2.5.1
     GlusterFS support            : NO
     TPM support                  : YES
     libssh support               : YES 0.9.3
     lzo support                  : YES
     snappy support               : YES
     bzip2 support                : YES
     lzfse support                : NO
     zstd support                 : NO
     NUMA host support            : YES
     capstone                     : YES 3.0.5
     libpmem support              : YES 1.8
     libdaxctl support            : NO
     libudev                      : YES 245
     FUSE lseek                   : NO
     selinux                      : YES 3.0

   Subprojects
     libvduse                     : YES
     libvhost-user                : YES



It took me 4 hours to install a Windows XP .
It took me 12 hours to install an AIX 7.2.

iostat on AIX during a yum update :
tty:      tin         tout    avg-cpu: % user % sys % idle *% iowait* physc % entc           0.0        720.0                0.7   5.8    0.0 *93.5* 1.0   99.4

Disks:         % tm_act     Kbps      tps    Kb_read   Kb_wrtn
cd0               0.0       0.0       0.0          0         0
hdisk0 *100.0*       0.0       0.0          0         0

my ubuntu 20.04 :
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           12.53    0.00    0.50    8.65    0.00   78.32

Device             tps    kB_read/s    kB_wrtn/s    kB_dscd/s kB_read    kB_wrtn    kB_dscd dm-0              0.00         0.00         0.00         0.00 0          0          0 dm-1            181.00         0.00       712.00         0.00 0        712          0 fd0               0.00         0.00         0.00         0.00 0          0          0 loop0             0.00         0.00         0.00         0.00 0          0          0 loop1             0.00         0.00         0.00         0.00 0          0          0 loop2             0.00         0.00         0.00         0.00 0          0          0 loop3             0.00         0.00         0.00         0.00 0          0          0 loop4             0.00         0.00         0.00         0.00 0          0          0 loop5             0.00         0.00         0.00         0.00 0          0          0 loop6             0.00         0.00         0.00         0.00 0          0          0 loop7             0.00         0.00         0.00         0.00 0          0          0 loop8             0.00         0.00         0.00         0.00 0          0          0 loop9             0.00         0.00         0.00         0.00 0          0          0 sda             103.00         0.00       632.00         0.00 0        632          0

why ?

thank you for your answers
Pascal






--
Narcis Garcia



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