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...4086 MB/sec -> 5545 MB/sec). > > > > filebench, 1 vm: > > ops/sec improved by 13% with the polling patch. Number of exits > was reduced by > > 31%. > > The same experiment with 3 vms running filebench showed similar numbers. > > > > Signed-off-by: Razya Ladelsky <razya at il.ibm.com> > > This really needs more thourough benchmarking report, including > system data. One good example for a related patch: > http://lwn.net/Articles/551179/ > though for virtualization, we need data about host as well, and if you > want to look...

...4086 MB/sec -> 5545 MB/sec). > > > > filebench, 1 vm: > > ops/sec improved by 13% with the polling patch. Number of exits > was reduced by > > 31%. > > The same experiment with 3 vms running filebench showed similar numbers. > > > > Signed-off-by: Razya Ladelsky <razya at il.ibm.com> > > This really needs more thourough benchmarking report, including > system data. One good example for a related patch: > http://lwn.net/Articles/551179/ > though for virtualization, we need data about host as well, and if you > want to look...

"Michael S. Tsirkin" <mst at redhat.com> wrote on 12/08/2014 12:18:50 PM: > From: "Michael S. Tsirkin" <mst at redhat.com> > To: David Miller <davem at davemloft.net> > Cc: Razya Ladelsky/Haifa/IBM at IBMIL, kvm at vger.kernel.org, Alex > Glikson/Haifa/IBM at IBMIL, Eran Raichstein/Haifa/IBM at IBMIL, Yossi > Kuperman1/Haifa/IBM at IBMIL, Joel Nider/Haifa/IBM at IBMIL, > abel.gordon at gmail.com, linux-kernel at vger.kernel.org, > netdev at vger.kernel.org,...

"Michael S. Tsirkin" <mst at redhat.com> wrote on 12/08/2014 12:18:50 PM: > From: "Michael S. Tsirkin" <mst at redhat.com> > To: David Miller <davem at davemloft.net> > Cc: Razya Ladelsky/Haifa/IBM at IBMIL, kvm at vger.kernel.org, Alex > Glikson/Haifa/IBM at IBMIL, Eran Raichstein/Haifa/IBM at IBMIL, Yossi > Kuperman1/Haifa/IBM at IBMIL, Joel Nider/Haifa/IBM at IBMIL, > abel.gordon at gmail.com, linux-kernel at vger.kernel.org, > netdev at vger.kernel.org,...

On 10/08/14 10:30, Razya Ladelsky wrote: > From: Razya Ladelsky <razya at il.ibm.com> > Date: Thu, 31 Jul 2014 09:47:20 +0300 > Subject: [PATCH] vhost: Add polling mode > > When vhost is waiting for buffers from the guest driver (e.g., more packets to > send in vhost-net's transmit queue), it n...

From: "Michael S. Tsirkin" <mst at redhat.com> Date: Sun, 10 Aug 2014 21:45:59 +0200 > On Sun, Aug 10, 2014 at 11:30:35AM +0300, Razya Ladelsky wrote: ... > And, did your tests actually produce 100% load on both host CPUs? ... Michael, please do not quote an entire patch just to ask a one line question. I truly, truly, wish it was simpler in modern email clients to delete the unrelated quoted material because I bet when peo...

From: "Michael S. Tsirkin" <mst at redhat.com> Date: Sun, 10 Aug 2014 21:45:59 +0200 > On Sun, Aug 10, 2014 at 11:30:35AM +0300, Razya Ladelsky wrote: ... > And, did your tests actually produce 100% load on both host CPUs? ... Michael, please do not quote an entire patch just to ask a one line question. I truly, truly, wish it was simpler in modern email clients to delete the unrelated quoted material because I bet when peo...

From: Razya Ladelsky <razya at il.ibm.com> Date: Thu, 31 Jul 2014 09:47:20 +0300 Subject: [PATCH] vhost: Add polling mode When vhost is waiting for buffers from the guest driver (e.g., more packets to send in vhost-net's transmit queue), it normally goes to sleep and waits for the guest to "kic...

From: Razya Ladelsky <razya at il.ibm.com> Date: Thu, 31 Jul 2014 09:47:20 +0300 Subject: [PATCH] vhost: Add polling mode When vhost is waiting for buffers from the guest driver (e.g., more packets to send in vhost-net's transmit queue), it normally goes to sleep and waits for the guest to "kic...

...d "C-states" features off. No Polling: 1 VM running netperf (msg size 64B): 1107 Mbits/sec Polling: 1 VM running netperf (msg size 64B): 1572 Mbits/sec As you can see from the new results, the numbers are lower, but relatively (polling on/off) there's no change. Thank you, Razya > > > > -- > > > MST > > > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >

...d "C-states" features off. No Polling: 1 VM running netperf (msg size 64B): 1107 Mbits/sec Polling: 1 VM running netperf (msg size 64B): 1572 Mbits/sec As you can see from the new results, the numbers are lower, but relatively (polling on/off) there's no change. Thank you, Razya > > > > -- > > > MST > > > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >

On Tue, Aug 12, 2014 at 01:57:05PM +0300, Razya Ladelsky wrote: > "Michael S. Tsirkin" <mst at redhat.com> wrote on 12/08/2014 12:18:50 PM: > > > From: "Michael S. Tsirkin" <mst at redhat.com> > > To: David Miller <davem at davemloft.net> > > Cc: Razya Ladelsky/Haifa/IBM at IBMIL, kv...

...ompare it to the polling utilization case (where vhost is always 100%). The best use case, of course, would be when the shared vhost thread work (TBD) is integrated and then vhost will actually be using its polling cycles to handle requests of multiple devices (even from multiple vms). Thanks, Razya

From: Razya Ladelsky > "Michael S. Tsirkin" <mst at redhat.com> wrote on 20/08/2014 01:57:10 PM: > > > > Results: > > > > > > Netperf, 1 vm: > > > The polling patch improved throughput by ~33% (1516 MB/sec -> 2046 MB/sec). > > > Number of e...

...ompare it to the polling utilization case (where vhost is always 100%). The best use case, of course, would be when the shared vhost thread work (TBD) is integrated and then vhost will actually be using its polling cycles to handle requests of multiple devices (even from multiple vms). Thanks, Razya

...>> > >> This series tries to add basic busy polling for vhost net. The idea is > >> simple: at the end of tx/rx processing, busy polling for new tx added > >> descriptor and rx receive socket for a while. > > There were several conciens Michael raised on the Razya's attempt to add > > polling to vhost-net ([1], [2]). Some of them seem relevant for these > > patches as well: > > > > - What happens in overcommit scenarios? > > We have an optimization here: busy polling will end if more than one > processes is runnable on...

...>> > >> This series tries to add basic busy polling for vhost net. The idea is > >> simple: at the end of tx/rx processing, busy polling for new tx added > >> descriptor and rx receive socket for a while. > > There were several conciens Michael raised on the Razya's attempt to add > > polling to vhost-net ([1], [2]). Some of them seem relevant for these > > patches as well: > > > > - What happens in overcommit scenarios? > > We have an optimization here: busy polling will end if more than one > processes is runnable on...

On Sun, Aug 17, 2014 at 03:35:39PM +0300, Razya Ladelsky wrote: > > > > > > Hi Michael, > > > > > > Sorry for the delay, had some problems with my mailbox, and I realized > > > > just now that > > > my reply wasn't sent. > > > The vm indeed ALWAYS utilized 100% cpu, wheth...

...> This series tries to add basic busy polling for vhost net. The > idea is > > >> simple: at the end of tx/rx processing, busy polling for new tx added > > >> descriptor and rx receive socket for a while. > > > There were several conciens Michael raised on the Razya's attempt > to add > > > polling to vhost-net ([1], [2]). Some of them seem relevant for these > > > patches as well: > > > > > > - What happens in overcommit scenarios? > > > > We have an optimization here: busy polling will end if more than o...

On Sun, Aug 10, 2014 at 11:30:35AM +0300, Razya Ladelsky wrote: > From: Razya Ladelsky <razya at il.ibm.com> > Date: Thu, 31 Jul 2014 09:47:20 +0300 > Subject: [PATCH] vhost: Add polling mode > > When vhost is waiting for buffers from the guest driver (e.g., more packets to > send in vhost-net's transmit queue), it n...