On 25/03/14 13:37, Paolo Bonzini wrote:
Il 25/03/2014 04:19, Gonglei (Arei) ha scritto:
Based on discussions in:
http://lists.gnu.org/archive/html/qemu-devel/2013-11/threads.html#03322
About KVM_SET_GSI_ROUTING ioctl, I tested changing RCU to SRCU, but
unfortunately
it looks like SRCU's
Based on discussions in:
http://lists.gnu.org/archive/html/qemu-devel/2013-11/threads.html#03322
About KVM_SET_GSI_ROUTING ioctl, I tested changing RCU to SRCU, but
unfortunately
it looks like SRCU's grace period is no better than RCU.
Really? This is not what Christian Borntraeger
On my system I have HZ=100 and lots of CPUs. So RCUs every cpu has
scheduled
is certainly slower than SRCUs algorithm
(/*
* We use an adaptive strategy for synchronize_srcu() and especially for
* synchronize_srcu_expedited(). We spin for a fixed time period
* (defined below) to allow
Il 26/03/2014 09:22, Gonglei (Arei) ha scritto:
Yes, previously I was using synchronize_srcu, which is not good. When I
changed it to synchronize_srcu_expedited, grace period delay is much better
than synchronize_srcu. Though in our tests, we can still see some impact
of KVM_SET_GSI_ROUTING
On 26/03/14 09:22, Gonglei (Arei) wrote:
Without patches, ping time can jump from 0.3ms to 2ms-30ms. With
synchronize_srcu
patch, ping time is worse. With synchronize_srcu_expedited patch, ping time
is
overall good, though sometimes ping time jump to 1ms-3ms.
Just to understand whats
On Wed, Mar 26, 2014 at 08:22:29AM +, Gonglei (Arei) wrote:
Based on discussions in:
http://lists.gnu.org/archive/html/qemu-devel/2013-11/threads.html#03322
About KVM_SET_GSI_ROUTING ioctl, I tested changing RCU to SRCU, but
unfortunately
it looks like SRCU's grace period is
Il 25/03/2014 04:19, Gonglei (Arei) ha scritto:
Based on discussions in:
http://lists.gnu.org/archive/html/qemu-devel/2013-11/threads.html#03322
About KVM_SET_GSI_ROUTING ioctl, I tested changing RCU to SRCU, but
unfortunately
it looks like SRCU's grace period is no better than RCU.
Really?
Hi,
Based on discussions in:
http://lists.gnu.org/archive/html/qemu-devel/2013-11/threads.html#03322
About KVM_SET_GSI_ROUTING ioctl, I tested changing RCU to SRCU, but
unfortunately
it looks like SRCU's grace period is no better than RCU. I haven't got any idea
why this, but I suppose the