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...SO8859-1" Here is a small example trying to replicate my problems: File:exp.Rnw ================================ \documentclass[10pt,twoside]{article} \usepackage[dvips]{graphicx} \usepackage[portuges]{babel} \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc} \begin{document} \section{Introdu????o} Isto ?? uma experi??ncia. \begin{figure}[b] \centering <<echo=false,fig=true,width=10,height=10>>= barras(1) @ \caption{Distribui????o dos valores percentuais.} \label{fig:idade} \end{figure} \end{document} ================================= The problem occurs when I Sweave thi...

...29.4 %CPU >> >> 3. w/ kvm dynamic poll: >> 35735.6 bit/s -- 200.0 %CPU > Actually we can reduce the CPU utilization by sleeping a period of > time as what has already been done in the poll logic of IO subsystem, > then we can improve the algorithm in kvm instead of introduing another > duplicate one in the kvm guest. We really appreciate upstream's kvm dynamic poll mechanism, which is really helpful for a lot of scenario.. However, as description said, in virtualization, idle path includes several heavy operations includes timer access (LAPIC timer or TSC dea...

...29.4 %CPU >> >> 3. w/ kvm dynamic poll: >> 35735.6 bit/s -- 200.0 %CPU > Actually we can reduce the CPU utilization by sleeping a period of > time as what has already been done in the poll logic of IO subsystem, > then we can improve the algorithm in kvm instead of introduing another > duplicate one in the kvm guest. We really appreciate upstream's kvm dynamic poll mechanism, which is really helpful for a lot of scenario.. However, as description said, in virtualization, idle path includes several heavy operations includes timer access (LAPIC timer or TSC dea...

...at 01:47:19PM +0800, Yuanhan Liu wrote: > Hi, > > For virtio-net, we use 2 descs for representing a (small) pkt. One for > virtio-net header and another one for the pkt data. And it has two issues: > > - the desc buffer for storing pkt data is halfed > > Though we later introduced 2 more options to overcome this: ANYLAY_OUT > and indirect desc. The indirect desc has another issue: it introdues > an extra cache line visit. So if we don't care about this part, we could maybe just add a descriptor flag that puts the whole header in the descriptor. > - virt...

...at 01:47:19PM +0800, Yuanhan Liu wrote: > Hi, > > For virtio-net, we use 2 descs for representing a (small) pkt. One for > virtio-net header and another one for the pkt data. And it has two issues: > > - the desc buffer for storing pkt data is halfed > > Though we later introduced 2 more options to overcome this: ANYLAY_OUT > and indirect desc. The indirect desc has another issue: it introdues > an extra cache line visit. So if we don't care about this part, we could maybe just add a descriptor flag that puts the whole header in the descriptor. > - virt...

...> 35787.7 bit/s -- 129.4 %CPU > > 3. w/ kvm dynamic poll: > 35735.6 bit/s -- 200.0 %CPU Actually we can reduce the CPU utilization by sleeping a period of time as what has already been done in the poll logic of IO subsystem, then we can improve the algorithm in kvm instead of introduing another duplicate one in the kvm guest. Regards, Wanpeng Li > > 4. w/patch and w/ kvm dynamic poll: > 42225.3 bit/s -- 198.7 %CPU > > 5. idle=poll > 37081.7 bit/s -- 998.1 %CPU > > > > w/ this patch, we will improve performance by 23%.. even we could im...

...t; 3. w/ kvm dynamic poll: >>> 35735.6 bit/s -- 200.0 %CPU >> >> Actually we can reduce the CPU utilization by sleeping a period of >> time as what has already been done in the poll logic of IO subsystem, >> then we can improve the algorithm in kvm instead of introduing another >> duplicate one in the kvm guest. > > We really appreciate upstream's kvm dynamic poll mechanism, which is > really helpful for a lot of scenario.. > > However, as description said, in virtualization, idle path includes > several heavy operations includes tim...

On 2017/11/13 18:53, Juergen Gross wrote: > On 13/11/17 11:06, Quan Xu wrote: >> From: Quan Xu <quan.xu0 at gmail.com> >> >> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >> in idle path which will poll for a while before we enter the real idle >> state. >> >> In virtualization, idle path includes several heavy operations

On 2017/11/13 18:53, Juergen Gross wrote: > On 13/11/17 11:06, Quan Xu wrote: >> From: Quan Xu <quan.xu0 at gmail.com> >> >> So far, pv_idle_ops.poll is the only ops for pv_idle. .poll is called >> in idle path which will poll for a while before we enter the real idle >> state. >> >> In virtualization, idle path includes several heavy operations