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[WIP] SLO Aware Routing support #439

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[WIP] SLO Aware Routing support #439

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1a17f16
go.mod: update GAIE to slo aware routing branch
RishabhSaini Nov 7, 2025
63a4cd2
switch to sloRoute GAIE
RishabhSaini Dec 8, 2025
23f9481
update gaie
RishabhSaini Dec 9, 2025
6b746ca
update start times
RishabhSaini Dec 9, 2025
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4 changes: 3 additions & 1 deletion go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ require (
sigs.k8s.io/gateway-api-inference-extension v1.0.0
)

replace sigs.k8s.io/gateway-api-inference-extension => github.com/RishabhSaini/gateway-api-inference-extension v0.0.0-20251107192434-0e0db125e842
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@zdtsw zdtsw Nov 26, 2025

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since we've got kubernetes-sigs/gateway-api-inference-extension#1839 in, should we use that one instead


require (
cel.dev/expr v0.24.0 // indirect
github.com/Masterminds/semver/v3 v3.4.0 // indirect
Expand Down Expand Up @@ -117,7 +119,7 @@ require (
gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20250707201910-8d1bb00bc6a7 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20250707201910-8d1bb00bc6a7 // indirect
google.golang.org/protobuf v1.36.7 // indirect
google.golang.org/protobuf v1.36.8 // indirect
gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
gopkg.in/inf.v0 v0.9.1 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
Expand Down
12 changes: 6 additions & 6 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@ github.com/AzureAD/microsoft-authentication-library-for-go v1.4.2 h1:oygO0locgZJ
github.com/AzureAD/microsoft-authentication-library-for-go v1.4.2/go.mod h1:wP83P5OoQ5p6ip3ScPr0BAq0BvuPAvacpEuSzyouqAI=
github.com/Masterminds/semver/v3 v3.4.0 h1:Zog+i5UMtVoCU8oKka5P7i9q9HgrJeGzI9SA1Xbatp0=
github.com/Masterminds/semver/v3 v3.4.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
github.com/RishabhSaini/gateway-api-inference-extension v0.0.0-20251107192434-0e0db125e842 h1:DR95wyTit+CVNFmgvG/x8JirvTdXAL1xtQ2Ui5GNxHQ=
github.com/RishabhSaini/gateway-api-inference-extension v0.0.0-20251107192434-0e0db125e842/go.mod h1:vTI7FeIhaNOOUC1eX+htUOruRjC8zunVBT/KGA9VSQE=
github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b h1:mimo19zliBX/vSQ6PWWSL9lK8qwHozUj03+zLoEB8O0=
github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b/go.mod h1:fvzegU4vN3H1qMT+8wDmzjAcDONcgo2/SZ/TyfdUOFs=
github.com/alicebob/miniredis/v2 v2.35.0 h1:QwLphYqCEAo1eu1TqPRN2jgVMPBweeQcR21jeqDCONI=
Expand Down Expand Up @@ -192,8 +194,8 @@ github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+
github.com/oklog/ulid v1.3.1 h1:EGfNDEx6MqHz8B3uNV6QAib1UR2Lm97sHi3ocA6ESJ4=
github.com/oklog/ulid/v2 v2.1.1 h1:suPZ4ARWLOJLegGFiZZ1dFAkqzhMjL3J1TzI+5wHz8s=
github.com/oklog/ulid/v2 v2.1.1/go.mod h1:rcEKHmBBKfef9DhnvX7y1HZBYxjXb0cP5ExxNsTT1QQ=
github.com/onsi/ginkgo/v2 v2.25.2 h1:hepmgwx1D+llZleKQDMEvy8vIlCxMGt7W5ZxDjIEhsw=
github.com/onsi/ginkgo/v2 v2.25.2/go.mod h1:43uiyQC4Ed2tkOzLsEYm7hnrb7UJTWHYNsuy3bG/snE=
github.com/onsi/ginkgo/v2 v2.25.3 h1:Ty8+Yi/ayDAGtk4XxmmfUy4GabvM+MegeB4cDLRi6nw=
github.com/onsi/ginkgo/v2 v2.25.3/go.mod h1:43uiyQC4Ed2tkOzLsEYm7hnrb7UJTWHYNsuy3bG/snE=
github.com/onsi/gomega v1.38.2 h1:eZCjf2xjZAqe+LeWvKb5weQ+NcPwX84kqJ0cZNxok2A=
github.com/onsi/gomega v1.38.2/go.mod h1:W2MJcYxRGV63b418Ai34Ud0hEdTVXq9NW9+Sx6uXf3k=
github.com/openai/openai-go v1.12.0 h1:NBQCnXzqOTv5wsgNC36PrFEiskGfO5wccfCWDo9S1U0=
Expand Down Expand Up @@ -356,8 +358,8 @@ google.golang.org/genproto/googleapis/rpc v0.0.0-20250707201910-8d1bb00bc6a7 h1:
google.golang.org/genproto/googleapis/rpc v0.0.0-20250707201910-8d1bb00bc6a7/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
google.golang.org/grpc v1.75.0 h1:+TW+dqTd2Biwe6KKfhE5JpiYIBWq865PhKGSXiivqt4=
google.golang.org/grpc v1.75.0/go.mod h1:JtPAzKiq4v1xcAB2hydNlWI2RnF85XXcV0mhKXr2ecQ=
google.golang.org/protobuf v1.36.7 h1:IgrO7UwFQGJdRNXH/sQux4R1Dj1WAKcLElzeeRaXV2A=
google.golang.org/protobuf v1.36.7/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
Expand Down Expand Up @@ -394,8 +396,6 @@ sigs.k8s.io/controller-runtime v0.22.0 h1:mTOfibb8Hxwpx3xEkR56i7xSjB+nH4hZG37Srl
sigs.k8s.io/controller-runtime v0.22.0/go.mod h1:FwiwRjkRPbiN+zp2QRp7wlTCzbUXxZ/D4OzuQUDwBHY=
sigs.k8s.io/gateway-api v1.3.0 h1:q6okN+/UKDATola4JY7zXzx40WO4VISk7i9DIfOvr9M=
sigs.k8s.io/gateway-api v1.3.0/go.mod h1:d8NV8nJbaRbEKem+5IuxkL8gJGOZ+FJ+NvOIltV8gDk=
sigs.k8s.io/gateway-api-inference-extension v1.0.0 h1:GsHvlu1Cn1t6+vrHoPdNNlpwKxf/y1HuQSlUjd58Ds8=
sigs.k8s.io/gateway-api-inference-extension v1.0.0/go.mod h1:qxSY10qt2+YnZJ43VfpMXa6wpiENPderI2BnNZ4Kxfc=
sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 h1:gBQPwqORJ8d8/YNZWEjoZs7npUVDpVXUUOFfW6CgAqE=
sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=
Expand Down
5 changes: 5 additions & 0 deletions pkg/plugins/scorer/active_request.go
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,11 @@ func (s *ActiveRequest) WithName(name string) *ActiveRequest {
return s
}

// Dependencies returns the list of plugin dependencies.
func (s *ActiveRequest) Dependencies() []plugins.TypedName {
return []plugins.TypedName{} // No dependencies
}

// Score scores the given pods based on the number of active requests
// being served by each pod. The score is normalized to a range of 0-1.
func (s *ActiveRequest) Score(ctx context.Context, _ *types.CycleState, _ *types.LLMRequest,
Expand Down
5 changes: 5 additions & 0 deletions pkg/plugins/scorer/load_aware.go
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,11 @@ func (s *LoadAware) WithName(name string) *LoadAware {
return s
}

// Dependencies returns the list of plugin dependencies.
func (s *LoadAware) Dependencies() []plugins.TypedName {
return []plugins.TypedName{} // No dependencies
}

// Score scores the given pod in range of 0-1
// Currently metrics contains number of requests waiting in the queue, there is no information about number of requests
// that can be processed in the given pod immediately.
Expand Down
5 changes: 5 additions & 0 deletions pkg/plugins/scorer/precise_prefix_cache.go
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Expand Up @@ -112,6 +112,11 @@ func (s *PrecisePrefixCacheScorer) WithName(name string) *PrecisePrefixCacheScor
return s
}

// Dependencies returns the list of plugin dependencies.
func (s *PrecisePrefixCacheScorer) Dependencies() []plugins.TypedName {
return []plugins.TypedName{} // No dependencies
}

// Score scores the provided pod based on the KVCache index state.
// The returned scores are normalized to a range of 0-1.
func (s *PrecisePrefixCacheScorer) Score(ctx context.Context, _ *types.CycleState, request *types.LLMRequest, pods []types.Pod) map[types.Pod]float64 {
Expand Down
23 changes: 14 additions & 9 deletions pkg/plugins/scorer/session_affinity.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ import (
"encoding/json"

"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/backend"
"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/handlers"
"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/plugins"
"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/requestcontrol"
"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/scheduling/framework"
Expand Down Expand Up @@ -56,6 +56,11 @@ func (s *SessionAffinity) WithName(name string) *SessionAffinity {
return s
}

// Dependencies returns the list of plugin dependencies.
func (s *SessionAffinity) Dependencies() []plugins.TypedName {
return []plugins.TypedName{} // No dependencies
}

// Score assign a high score to the pod used in previous requests and zero to others
func (s *SessionAffinity) Score(ctx context.Context, _ *types.CycleState, request *types.LLMRequest, pods []types.Pod) map[types.Pod]float64 {
scoredPods := make(map[types.Pod]float64)
Expand Down Expand Up @@ -84,19 +89,19 @@ func (s *SessionAffinity) Score(ctx context.Context, _ *types.CycleState, reques
// TODO: this should be using a cookie and ensure not overriding any other
// cookie values if present.
// Tracked in https://github.com/llm-d/llm-d-inference-scheduler/issues/28
func (s *SessionAffinity) PostResponse(ctx context.Context, _ *types.LLMRequest, response *requestcontrol.Response, targetPod *backend.Pod) {
if response == nil || targetPod == nil {
func (s *SessionAffinity) PostResponse(ctx context.Context, reqCtx *handlers.RequestContext) {
if reqCtx == nil || reqCtx.Response == nil || reqCtx.TargetPod == nil {
reqID := "undefined"
if response != nil {
reqID = response.RequestId
if reqCtx != nil && reqCtx.SchedulingRequest != nil {
reqID = reqCtx.SchedulingRequest.RequestId
}
log.FromContext(ctx).V(logutil.DEBUG).Info("Session affinity scorer - skip post response because one of response, targetPod is nil", "req id", reqID)
log.FromContext(ctx).V(logutil.DEBUG).Info("Session affinity scorer - skip post response because one of reqCtx, response, targetPod is nil", "req id", reqID)
return
}

if response.Headers == nil { // TODO should always be populated?
response.Headers = make(map[string]string)
if reqCtx.Response.Headers == nil { // TODO should always be populated?
reqCtx.Response.Headers = make(map[string]string)
}

response.Headers[sessionTokenHeader] = base64.StdEncoding.EncodeToString([]byte(targetPod.NamespacedName.String()))
reqCtx.Response.Headers[sessionTokenHeader] = base64.StdEncoding.EncodeToString([]byte(reqCtx.TargetPod.NamespacedName.String()))
}