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mmc: mmc_test: make performance test area size about 4MiB

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The test area size was set to the preferred erase size but for comparison
purposes it is better if it is the same size for different devices.  Make
it a multiple of preferred erase size that is greater than or equal to 4MiB.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Adrian Hunter 2011-02-08 13:41:01 +02:00 committed by Chris Ball
parent 12f8ef8fb2
commit 0532ff6358
1 changed files with 13 additions and 12 deletions
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25
drivers/mmc/card/mmc_test.c
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@ -1426,28 +1426,29 @@ static int mmc_test_area_cleanup(struct mmc_test_card *test)
} }
/* /*
* Initialize an area for testing large transfers. The size of the area is the * Initialize an area for testing large transfers. The test area is set to the
* preferred erase size which is a good size for optimal transfer speed. Note * middle of the card because cards may have different charateristics at the
* that is typically 4MiB for modern cards. The test area is set to the middle * front (for FAT file system optimization). Optionally, the area is erased
* of the card because cards may have different charateristics at the front * (if the card supports it) which may improve write performance. Optionally,
* (for FAT file system optimization). Optionally, the area is erased (if the * the area is filled with data for subsequent read tests.
* card supports it) which may improve write performance. Optionally, the area
* is filled with data for subsequent read tests.
*/ */
static int mmc_test_area_init(struct mmc_test_card *test, int erase, int fill) static int mmc_test_area_init(struct mmc_test_card *test, int erase, int fill)
{ {
struct mmc_test_area *t = &test->area; struct mmc_test_area *t = &test->area;
unsigned long min_sz = 64 * 1024; unsigned long min_sz = 64 * 1024, sz;
int ret; int ret;
ret = mmc_test_set_blksize(test, 512); ret = mmc_test_set_blksize(test, 512);
if (ret) if (ret)
return ret; return ret;
if (test->card->pref_erase > TEST_AREA_MAX_SIZE >> 9) /* Make the test area size about 4MiB */
t->max_sz = TEST_AREA_MAX_SIZE; sz = (unsigned long)test->card->pref_erase << 9;
else t->max_sz = sz;
t->max_sz = (unsigned long)test->card->pref_erase << 9; while (t->max_sz < 4 * 1024 * 1024)
t->max_sz += sz;
while (t->max_sz > TEST_AREA_MAX_SIZE && t->max_sz > sz)
t->max_sz -= sz;
t->max_segs = test->card->host->max_segs; t->max_segs = test->card->host->max_segs;
t->max_seg_sz = test->card->host->max_seg_size; t->max_seg_sz = test->card->host->max_seg_size;