flywithu/ntel-gpu-tools
1
0
Fork 0
mirror of https://github.com/tiagovignatti/intel-gpu-tools.git synced 2025-06-11 01:46:14 +00:00
Code Issues Releases Wiki Activity

igt/gem_close_race: Trim object size

Browse Source 
The challenge here is to race GPU activity versus the gem_close. Using a
large objects makes the window of GPU activity larger - except on !llc
systems we then incur massive overhead from clflush, likely destroying
any race (due to mutex contention). And that mutex contention is
amplified by the number of cores - bad news for Baytrail.

Give up and make the objects smaller and hope that the test is run
frequently enough to catch the race.

References: https://bugs.freedesktop.org/show_bug.cgi?id=71029
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-07-11 23:36:15 +01:00
parent f796d9958b
commit 98165d60be
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tests/gem_close_race.c
View File

@ -42,7 +42,7 @@
#include "drmtest.h"
#include "intel_chipset.h"
#define OBJECT_SIZE 1024*1024*4
#define OBJECT_SIZE 4096
#define COPY_BLT_CMD (2<<29|0x53<<22|0x6)
#define BLT_WRITE_ALPHA (1<<21)
@ -71,7 +71,7 @@ static void selfcopy(int fd, uint32_t handle, int loops)
b++;
*b++ = 0xcc << 16 | 1 << 25 | 1 << 24 | (4*1024);
*b++ = 0;
*b++ = 512 << 16 | 1024;
*b++ = 1 << 16 | 1024;
reloc[0].offset = (b - buf) * sizeof(*b);
reloc[0].target_handle = handle;
@ -130,7 +130,7 @@ static uint32_t load(int fd)
if (handle == 0)
return 0;
selfcopy(fd, handle, 30);
selfcopy(fd, handle, 100);
return handle;
}
@ -172,7 +172,7 @@ static void *thread_run(void *_data)
if (create.handle == 0)
continue;
selfcopy(t->fds[n], create.handle, 10);
selfcopy(t->fds[n], create.handle, 100);
drmIoctl(t->fds[n], DRM_IOCTL_GEM_CLOSE, &create.handle);
}
@ -204,7 +204,7 @@ static void *thread_busy(void *_data)
if (create.handle == 0)
continue;
selfcopy(t->fds[n], create.handle, 1);
selfcopy(t->fds[n], create.handle, 10);
busy.handle = create.handle;
drmIoctl(t->fds[n], DRM_IOCTL_I915_GEM_BUSY, &busy);