search for: kernbench

...cate if we > > need to do PV kicking of suspended spinners -- on modern chips xadd > > isn't (much) more expensive than an add + load. > > > > Result: > > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > > benchmark overcommit %improve > > kernbench 1x -0.13 > > kernbench 2x 0.02 > > dbench 1x -1.77 > > dbench 2x -0.63 > > > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > > [Oleg: Moving slowpath flag to head, ticket_equals idea] > > [PeterZ:...

...cate if we > > need to do PV kicking of suspended spinners -- on modern chips xadd > > isn't (much) more expensive than an add + load. > > > > Result: > > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > > benchmark overcommit %improve > > kernbench 1x -0.13 > > kernbench 2x 0.02 > > dbench 1x -1.77 > > dbench 2x -0.63 > > > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > > [Oleg: Moving slowpath flag to head, ticket_equals idea] > > [PeterZ:...

Future AMD SVM supports a new feature called flush by ASID. The idea is to allow CPU to flush TLBs associated with the ASID assigned to guest VM. So hypervisor doesn''t have to reassign a new ASID in order to flush guest''s VCPU. Please review it. Thanks, Wei Signed-off-by: Wei Huang <wei.huang2@amd.com> Signed-off-by: Wei Wang <wei.wang2@amd.com> -- Advanced Micro

...sing xadd; the prev head value will include the slowpath flag and indicate if we need to do PV kicking of suspended spinners -- on modern chips xadd isn't (much) more expensive than an add + load. Result: setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) benchmark overcommit %improve kernbench 1x -0.13 kernbench 2x 0.02 dbench 1x -1.77 dbench 2x -0.63 [Jeremy: hinted missing TICKET_LOCK_INC for kick] [Oleg: Moving slowpath flag to head, ticket_equals idea] [PeterZ: Detailed changelog] Reported-by: Sasha Levin <sasha.levin at orac...

...sing xadd; the prev head value will include the slowpath flag and indicate if we need to do PV kicking of suspended spinners -- on modern chips xadd isn't (much) more expensive than an add + load. Result: setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) benchmark overcommit %improve kernbench 1x -0.13 kernbench 2x 0.02 dbench 1x -1.77 dbench 2x -0.63 [Jeremy: hinted missing TICKET_LOCK_INC for kick] [Oleg: Moving slowpath flag to head, ticket_equals idea] [PeterZ: Detailed changelog] Reported-by: Sasha Levin <sasha.levin at orac...

...sing xadd; the prev head value will include the slowpath flag and indicate if we need to do PV kicking of suspended spinners -- on modern chips xadd isn't (much) more expensive than an add + load. Result: setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) benchmark overcommit %improve kernbench 1x -0.13 kernbench 2x 0.02 dbench 1x -1.77 dbench 2x -0.63 [Jeremy: hinted missing TICKET_LOCK_INC for kick] [Oleg: Moving slowpath flag to head, ticket_equals idea] [PeterZ: Detailed changelog] Reported-by: Sasha Levin <sasha.levin at orac...

...sing xadd; the prev head value will include the slowpath flag and indicate if we need to do PV kicking of suspended spinners -- on modern chips xadd isn't (much) more expensive than an add + load. Result: setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) benchmark overcommit %improve kernbench 1x -0.13 kernbench 2x 0.02 dbench 1x -1.77 dbench 2x -0.63 [Jeremy: hinted missing TICKET_LOCK_INC for kick] [Oleg: Moving slowpath flag to head, ticket_equals idea] [PeterZ: Detailed changelog] Reported-by: Sasha Levin <sasha.levin at orac...

...nclude the slowpath flag and indicate if we > need to do PV kicking of suspended spinners -- on modern chips xadd > isn't (much) more expensive than an add + load. > > Result: > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > benchmark overcommit %improve > kernbench 1x -0.13 > kernbench 2x 0.02 > dbench 1x -1.77 > dbench 2x -0.63 > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > [Oleg: Moving slowpath flag to head, ticket_equals idea] > [PeterZ: Detailed changelog] > > Re...

...nclude the slowpath flag and indicate if we > need to do PV kicking of suspended spinners -- on modern chips xadd > isn't (much) more expensive than an add + load. > > Result: > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > benchmark overcommit %improve > kernbench 1x -0.13 > kernbench 2x 0.02 > dbench 1x -1.77 > dbench 2x -0.63 > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > [Oleg: Moving slowpath flag to head, ticket_equals idea] > [PeterZ: Detailed changelog] > > Re...

...t: Test system: 32cpu 2node machine w/ 64GB each (16 pcpu machine +ht). Guests: 8GB 16vcpu guests (average of 8 iterations) % Improvements with kvm guests (batch size = 4): ebizzy_0.5x 4.3 ebizzy_1.0x 7.8 ebizzy_1.5x 23.4 ebizzy_2.0x 48.6 Baremetal: ebizzy showed very high stdev, kernbench result was good but both of them did not show much difference. ebizzy: rec/sec higher is better base 50452 patched 50703 kernbench time in sec (lesser is better) base 48.9 sec patched 48.8 sec Signed-off-by: Raghavendra K T <raghavendra.kt at linux.vnet.ibm.com> --- arch/x86/includ...

...t: Test system: 32cpu 2node machine w/ 64GB each (16 pcpu machine +ht). Guests: 8GB 16vcpu guests (average of 8 iterations) % Improvements with kvm guests (batch size = 4): ebizzy_0.5x 4.3 ebizzy_1.0x 7.8 ebizzy_1.5x 23.4 ebizzy_2.0x 48.6 Baremetal: ebizzy showed very high stdev, kernbench result was good but both of them did not show much difference. ebizzy: rec/sec higher is better base 50452 patched 50703 kernbench time in sec (lesser is better) base 48.9 sec patched 48.8 sec Signed-off-by: Raghavendra K T <raghavendra.kt at linux.vnet.ibm.com> --- arch/x86/includ...

...include the slowpath flag and indicate if we > need to do PV kicking of suspended spinners -- on modern chips xadd > isn't (much) more expensive than an add + load. > > Result: > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > benchmark overcommit %improve > kernbench 1x -0.13 > kernbench 2x 0.02 > dbench 1x -1.77 > dbench 2x -0.63 > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > [Oleg: Moving slowpath flag to head, ticket_equals idea] > [PeterZ: Detailed changelog] > > Rep...

...include the slowpath flag and indicate if we > need to do PV kicking of suspended spinners -- on modern chips xadd > isn't (much) more expensive than an add + load. > > Result: > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > benchmark overcommit %improve > kernbench 1x -0.13 > kernbench 2x 0.02 > dbench 1x -1.77 > dbench 2x -0.63 > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > [Oleg: Moving slowpath flag to head, ticket_equals idea] > [PeterZ: Detailed changelog] > > Rep...

...o PV kicking of suspended spinners -- on modern chips xadd > > > isn't (much) more expensive than an add + load. > > > > > > Result: > > > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > > > benchmark overcommit %improve > > > kernbench 1x -0.13 > > > kernbench 2x 0.02 > > > dbench 1x -1.77 > > > dbench 2x -0.63 > > > > > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > > > [Oleg: Moving slowpath flag to head, ticket_e...

...o PV kicking of suspended spinners -- on modern chips xadd > > > isn't (much) more expensive than an add + load. > > > > > > Result: > > > setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) > > > benchmark overcommit %improve > > > kernbench 1x -0.13 > > > kernbench 2x 0.02 > > > dbench 1x -1.77 > > > dbench 2x -0.63 > > > > > > [Jeremy: hinted missing TICKET_LOCK_INC for kick] > > > [Oleg: Moving slowpath flag to head, ticket_e...

...need to do PV kicking of suspended spinners -- on modern chips xadd >>> isn't (much) more expensive than an add + load. >>> >>> Result: >>> setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) >>> benchmark overcommit %improve >>> kernbench 1x -0.13 >>> kernbench 2x 0.02 >>> dbench 1x -1.77 >>> dbench 2x -0.63 >>> >>> [Jeremy: hinted missing TICKET_LOCK_INC for kick] >>> [Oleg: Moving slowpath flag to head, ticket_equals idea...

...need to do PV kicking of suspended spinners -- on modern chips xadd >>> isn't (much) more expensive than an add + load. >>> >>> Result: >>> setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) >>> benchmark overcommit %improve >>> kernbench 1x -0.13 >>> kernbench 2x 0.02 >>> dbench 1x -1.77 >>> dbench 2x -0.63 >>> >>> [Jeremy: hinted missing TICKET_LOCK_INC for kick] >>> [Oleg: Moving slowpath flag to head, ticket_equals idea...

...kernel performance is similar to BASE when there is no lock contention. But once we start seeing more contention, patched kernel outperforms BASE (non PLE). On PLE machine we do not see greater performance improvement because of PLE complimenting halt() 3 guests with 8VCPU, 4GB RAM, 1 used for kernbench (kernbench -f -H -M -o 20) other for cpuhog (shell script while true with an instruction) scenario A: unpinned 1x: no hogs 2x: 8hogs in one guest 3x: 8hogs each in two guest scenario B: unpinned, run kernbench on all the guests no hogs. Dbench on PLE machine: dbench run on all the guest simulta...

...kernel performance is similar to BASE when there is no lock contention. But once we start seeing more contention, patched kernel outperforms BASE (non PLE). On PLE machine we do not see greater performance improvement because of PLE complimenting halt() 3 guests with 8VCPU, 4GB RAM, 1 used for kernbench (kernbench -f -H -M -o 20) other for cpuhog (shell script while true with an instruction) scenario A: unpinned 1x: no hogs 2x: 8hogs in one guest 3x: 8hogs each in two guest scenario B: unpinned, run kernbench on all the guests no hogs. Dbench on PLE machine: dbench run on all the guest simulta...

...sing xadd; the prev head value will include the slowpath flag and indicate if we need to do PV kicking of suspended spinners -- on modern chips xadd isn't (much) more expensive than an add + load. Result: setup: 16core (32 cpu +ht sandy bridge 8GB 16vcpu guest) benchmark overcommit %improve kernbench 1x -0.13 kernbench 2x 0.02 dbench 1x -1.77 dbench 2x -0.63 [Jeremy: hinted missing TICKET_LOCK_INC for kick] [Oleg: Moving slowpath flag to head, ticket_equals idea] [PeterZ: Detailed changelog] Reported-by: Sasha Levin <sasha.levin at orac...