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discover: Disable flash attention for Jetson Xavier (CC 7.2) 

GGML picks the wrong kernel and these systems fail with:
Sep 28 22:25:39 xavier ollama[48999]: //ml/backend/ggml/ggml/src/ggml-cuda/fattn-wmma-f16.cu:437:
ERROR: CUDA kernel flash_attn_ext_f16 has no device code compatible with CUDA arch 720. ggml-cuda.cu
was compiled for: __CUDA_ARCH_LIST__

Fixes #12442
This commit is contained in:
Jesse Gross 2025-10-07 11:37:58 -07:00
parent bc71278670
commit 06b7ee7781
3 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
discover/gpu.go
View File

@ -2,7 +2,6 @@ package discover
import (
"context"
"fmt"
"log/slog"
"os"
"path/filepath"
@ -60,17 +59,14 @@ func devInfoToInfoList(devs []ml.DeviceInfo) GpuInfoList {
DependencyPath: dev.LibraryPath,
DriverMajor: dev.DriverMajor,
DriverMinor: dev.DriverMinor,
ComputeMajor: dev.ComputeMajor,
ComputeMinor: dev.ComputeMinor,
}
if dev.Library == "CUDA" || dev.Library == "ROCm" {
info.MinimumMemory = 457 * format.MebiByte
}
if dev.Library == "ROCm" {
info.Compute = fmt.Sprintf("gfx%x%02x", dev.ComputeMajor, dev.ComputeMinor)
if rocmDir != "" {
info.DependencyPath = append(info.DependencyPath, rocmDir)
}
} else {
info.Compute = fmt.Sprintf("%d.%d", dev.ComputeMajor, dev.ComputeMinor)
if dev.Library == "ROCm" && rocmDir != "" {
info.DependencyPath = append(info.DependencyPath, rocmDir)
}
resp = append(resp, info)
}

9
discover/types.go
View File

@ -37,9 +37,10 @@ type GpuInfo struct { // TODO better name maybe "InferenceProcessor"?
UnreliableFreeMemory bool
// GPU information
filterID string // AMD Workaround: The numeric ID of the device used to filter out other devices
Name string `json:"name"` // user friendly name if available
Compute string `json:"compute"` // Compute Capability or gfx
filterID string // AMD Workaround: The numeric ID of the device used to filter out other devices
Name string `json:"name"` // user friendly name if available
ComputeMajor int `json:"compute_major"` // Compute Capability or gfx
ComputeMinor int `json:"compute_minor"`
// Driver Information - TODO no need to put this on each GPU
DriverMajor int `json:"driver_major,omitempty"`
@ -173,7 +174,7 @@ func (l GpuInfoList) FlashAttentionSupported() bool {
for _, gpu := range l {
supportsFA := gpu.Library == "cpu" ||
gpu.Name == "Metal" || gpu.Library == "Metal" ||
(gpu.Library == "CUDA" && gpu.DriverMajor >= 7) ||
(gpu.Library == "CUDA" && gpu.DriverMajor >= 7 && !(gpu.ComputeMajor == 7 && gpu.ComputeMinor == 2)) || // We don't have kernels for Jetson Xavier
gpu.Library == "ROCm"
if !supportsFA {

9
llm/memory.go
View File

@ -266,11 +266,18 @@ func estimateGPULayers(gpus []discover.GpuInfo, f *ggml.GGML, projectors []strin
}
// Only include GPUs that can fit the graph, gpu minimum, the layer buffer and at least more layer
if gpus[i].FreeMemory < overhead+gzo+max(graphPartialOffload, graphFullOffload)+gpus[i].MinimumMemory+2*layerSize {
var compute string
if gpus[i].Library == "ROCm" {
compute = fmt.Sprintf("gfx%x%02x", gpus[i].ComputeMajor, gpus[i].ComputeMinor)
} else {
compute = fmt.Sprintf("%d.%d", gpus[i].ComputeMajor, gpus[i].ComputeMinor)
}
slog.Debug("gpu has too little memory to allocate any layers",
"id", gpus[i].ID,
"library", gpus[i].Library,
"variant", gpus[i].Variant,
"compute", gpus[i].Compute,
"compute", compute,
"driver", fmt.Sprintf("%d.%d", gpus[i].DriverMajor, gpus[i].DriverMinor),
"name", gpus[i].Name,
"total", format.HumanBytes2(gpus[i].TotalMemory),