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xen-users
RE: [Xen-users] Openldap 2.3 very very slow under Xen 3.0.2 ... why ?
I use a xeon 3.6Ghz with 3gb of memroy. I've assigned 196Mb to this domU.
When I try to make a search
I use vlan inside domU
#cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.00GHz
stepping : 3
cpu MHz : 3000.252
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush
d ts acpi mmx fxsr sse sse2 ss ht
tm pbe nx lm constant_tsc pni monitor ds_cpl cid
cx16 xtpr
bogomips : 7504.77
#cat /proc/interrupts
CPU0
256: 39881 Dynamic-irq timer0
257: 0 Dynamic-irq resched0
258: 0 Dynamic-irq callfunc0
259: 235 Dynamic-irq xenbus
260: 3130 Dynamic-irq xencons
261: 5686 Dynamic-irq blkif
262: 1 Dynamic-irq blkif
263: 31658 Dynamic-irq eth0
xentop - 18:53:06 Xen 3.0.2-3
12 domains: 1 running, 11 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 3144744k total, 2631408k used, 513336k free CPUs: 2 @ 3000MHz
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%)
VCPUS NETS NETTX(k) NETRX(k) SSID
compilbox --b--- 11784 0.0 200480 6.4 200704 6.4
1 1 1427316 1100251 0
dhcp-cpe --b--- 113 0.2 130924 4.2 131072 4.2
1 1 58160 106174 0
dhcp-modems --b--- 118 0.2 130840 4.2 131072 4.2
1 1 12101 189824 0
dhcp-oficina --b--- 368 0.0 130916 4.2 131072 4.2
1 1 292267 883858 0
Domain-0 -----r 10633 0.4 878792 27.9 no limit n/a
2 8 85484 1354237 0
ldap --b--- 12 0.1 200456 6.4 200704 6.4
1 1 143 2331 0
mail --b--- 29 0.0 200532 6.4 200704 6.4
1 1 458 11379 0
mysql --b--- 993 0.1 200512 6.4 200704 6.4
1 1 1067382 1444541 0
ns --b--- 17 0.0 130856 4.2 131072 4.2
1 1 443 11408 0
nscache --b--- 16 0.0 130900 4.2 131072 4.2
1 1 64 11094 0
syslog --b--- 29543 0.3 130888 4.2 131072 4.2
1 1 1442386 1772439 0
www --b--- 25 0.0 130900 4.2 131072 4.2
1 1 2472 25876 0
> Message du 26/10/06 18:36
> De : "Petersson, Mats" <Mats.Petersson@xxxxxxx>
> A : s.cramatte@xxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
> Copie à :
> Objet : RE: [Xen-users] Openldap 2.3 very very slow under Xen 3.0.2 ... why ?
>
>
>
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> > Sébastien CRAMATTE
> > Sent: 26 October 2006 17:19
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-users] Openldap 2.3 very very slow under Xen
> > 3.0.2 ... why ?
> >
> > Hi,
> >
> > I've just installed an openldap 2.3 inside a debian etch domU.
> > Openldap is very very slow with db4.2, 4.3, ... and I dont' why ???
>
> Compared to what?
>
> What is the setup of the machine you're running this on?
>
> How many [VP]CPU(s) are you using for the guest(s) involved?
>
> The post you refer (actually, the response to it) refers to nanosleep() being
> slow... It is entirely possible that the openldap is using nanosleep in a way
> that is "unsound" for Xen - as nanosleep is presumably intended to sleep for
> a very short amount of time. Since the sleep causes a domain switch, it may
> cause much longer sleep periods than the author of the code intended.
>
> I'm not sure if it's feasible to "stub out" those nanosleep operations in
> some way that doesn't cause some other problems, but if there is a way to do
> that, you could try that...
>
> N.B. I have absolutely no experience in using openldap at all - so I may be
> missing some HUGE parcel of information that would help to solve the
> problem...
>
> --
> Mats
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>
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