Re: disappointing speed with virtio_blk

[Gerd von Egidy <lists@egidy.de>]

Hi Marcelo,

> > > 
http://www.mail-archive.com/kvm-devel@lists.sourceforge.net/msg14732.html
> >
> > I tried it this evening with kvm 66 - which should include your patch,
> > right?
>
> No its not included. The issue is being worked on.

my bad, sorry.

Now I know I really have that patch: qemu-kvm hangs :(

I was trying kvm 66 with only the patch listed above applied on an otherwise 
perfectly working vm with virtio_blk root partition:

Last line of the booting kernel in my vnc window:

Serial: 8250/16550 driver $Revision 1.90... (you know the rest)

an strace of the qemu-kvm gave the following in rapid succession:

clock_gettime(CLOCK_MONOTONIC, {2565, 306799672}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 307065342}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 307354930}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 307618803}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 307886312}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0, 0, {it_interval={0, 0}, it_value={0, 33000000}}, NULL) = 0
rt_sigtimedwait([USR1 USR2 ALRM IO], {si_signo=SIGALRM, si_code=SI_TIMER, 
si_pid=0, si_uid=0, si_value={int=0, ptr=0}}, 0xbfe5af88, 8) = 14
rt_sigaction(SIGALRM, NULL, {0x804d8f8, ~[KILL STOP RTMIN RT_1], 0}, 8) = 0
select(12, [6 11], [], [], {0, 0})      = 0 (Timeout)
select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {2565, 342895116}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 343164113}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 343454002}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 343716804}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 343980012}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0, 0, {it_interval={0, 0}, it_value={0, 33000000}}, NULL) = 0
rt_sigtimedwait([USR1 USR2 ALRM IO], {si_signo=SIGALRM, si_code=SI_TIMER, 
si_pid=0, si_uid=0, si_value={int=0, ptr=0}}, 0xbfe5af88, 8) = 14
rt_sigaction(SIGALRM, NULL, {0x804d8f8, ~[KILL STOP RTMIN RT_1], 0}, 8) = 0
select(12, [6 11], [], [], {0, 0})      = 0 (Timeout)
select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {2565, 379035364}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 379307884}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 379589434}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 379919100}) = 0
clock_gettime(CLOCK_MONOTONIC, {2565, 380183834}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0, 0}}) = 0
timer_settime(0, 0, {it_interval={0, 0}, it_value={0, 33000000}}, NULL) = 0
rt_sigtimedwait([USR1 USR2 ALRM IO], {si_signo=SIGALRM, si_code=SI_TIMER, 
si_pid=0, si_uid=0, si_value={int=0, ptr=0}}, 0xbfe5af88, 8) = 14
rt_sigaction(SIGALRM, NULL, {0x804d8f8, ~[KILL STOP RTMIN RT_1], 0}, 8) = 0
select(12, [6 11], [], [], {0, 0})      = 0 (Timeout)
select(0, [], NULL, NULL, {0, 0})       = 0 (Timeout)
...

Hope that helps.

Kind regards,

Gerd


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