From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 23 Feb 2011 23:09:36 +0000 (+0000)
Subject: intel: gen3 is particular sensitive to batch size
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=671018aa99528a41955654f62120eeea0c5517e1;p=mesa.git

intel: gen3 is particular sensitive to batch size

... and prefers a small batch whereas gen4+ prefer a large batch to
carry more state.

Tuning using openarena/padman indicate that a batch size of just 4096 is
best for those cases.

Bugzilla: https://bugs.freedesktop.org/process_bug.cgi
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 7dbd9d9dde2..d22fa27aaa6 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -746,7 +746,7 @@ intelInitContext(struct intel_context *intel,
 
    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
                        sPriv->myNum, (intel->gen >= 4) ? "i965" : "i915");
-   if (intelScreen->deviceID == PCI_CHIP_I865_G)
+   if (intel->gen < 4)
       intel->maxBatchSize = 4096;
    else
       intel->maxBatchSize = sizeof(intel->batch.map);