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mmc: mmc_test: test to measure how sg_len affect performance
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Add a test that measures how the mmc bandwidth depends on the numbers of
sg elements in the sg list. The transfer size if fixed and sg length goes
from a few up to 512. The purpose is to measure overhead caused by
multiple sg elements.

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Venkatraman S <svenkatr@ti.com>
Tested-by: Sourav Poddar <sourav.poddar@ti.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
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Per Forlin authored and Chris Ball committed Jul 20, 2011
1 parent 9f9c418 commit bf04333
Showing 1 changed file with 139 additions and 12 deletions.
151 changes: 139 additions & 12 deletions drivers/mmc/card/mmc_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,7 @@ enum mmc_test_prep_media {
};

struct mmc_test_multiple_rw {
unsigned int *sg_len;
unsigned int *bs;
unsigned int len;
unsigned int size;
Expand Down Expand Up @@ -387,21 +388,26 @@ static struct mmc_test_mem *mmc_test_alloc_mem(unsigned long min_sz,
* Map memory into a scatterlist. Optionally allow the same memory to be
* mapped more than once.
*/
static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned long sz,
static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned long size,
struct scatterlist *sglist, int repeat,
unsigned int max_segs, unsigned int max_seg_sz,
unsigned int *sg_len)
unsigned int *sg_len, int min_sg_len)
{
struct scatterlist *sg = NULL;
unsigned int i;
unsigned long sz = size;

sg_init_table(sglist, max_segs);
if (min_sg_len > max_segs)
min_sg_len = max_segs;

*sg_len = 0;
do {
for (i = 0; i < mem->cnt; i++) {
unsigned long len = PAGE_SIZE << mem->arr[i].order;

if (min_sg_len && (size / min_sg_len < len))
len = ALIGN(size / min_sg_len, 512);
if (len > sz)
len = sz;
if (len > max_seg_sz)
Expand Down Expand Up @@ -574,11 +580,12 @@ static void mmc_test_print_avg_rate(struct mmc_test_card *test, uint64_t bytes,

printk(KERN_INFO "%s: Transfer of %u x %u sectors (%u x %u%s KiB) took "
"%lu.%09lu seconds (%u kB/s, %u KiB/s, "
"%u.%02u IOPS)\n",
"%u.%02u IOPS, sg_len %d)\n",
mmc_hostname(test->card->host), count, sectors, count,
sectors >> 1, (sectors & 1 ? ".5" : ""),
(unsigned long)ts.tv_sec, (unsigned long)ts.tv_nsec,
rate / 1000, rate / 1024, iops / 100, iops % 100);
rate / 1000, rate / 1024, iops / 100, iops % 100,
test->area.sg_len);

mmc_test_save_transfer_result(test, count, sectors, ts, rate, iops);
}
Expand Down Expand Up @@ -1412,7 +1419,7 @@ static int mmc_test_no_highmem(struct mmc_test_card *test)
* Map sz bytes so that it can be transferred.
*/
static int mmc_test_area_map(struct mmc_test_card *test, unsigned long sz,
int max_scatter)
int max_scatter, int min_sg_len)
{
struct mmc_test_area *t = &test->area;
int err;
Expand All @@ -1425,7 +1432,7 @@ static int mmc_test_area_map(struct mmc_test_card *test, unsigned long sz,
&t->sg_len);
} else {
err = mmc_test_map_sg(t->mem, sz, t->sg, 1, t->max_segs,
t->max_seg_sz, &t->sg_len);
t->max_seg_sz, &t->sg_len, min_sg_len);
}
if (err)
printk(KERN_INFO "%s: Failed to map sg list\n",
Expand All @@ -1451,7 +1458,7 @@ static int mmc_test_area_transfer(struct mmc_test_card *test,
static int mmc_test_area_io_seq(struct mmc_test_card *test, unsigned long sz,
unsigned int dev_addr, int write,
int max_scatter, int timed, int count,
bool nonblock)
bool nonblock, int min_sg_len)
{
struct timespec ts1, ts2;
int ret = 0;
Expand All @@ -1474,7 +1481,7 @@ static int mmc_test_area_io_seq(struct mmc_test_card *test, unsigned long sz,
sz = max_tfr;
}

ret = mmc_test_area_map(test, sz, max_scatter);
ret = mmc_test_area_map(test, sz, max_scatter, min_sg_len);
if (ret)
return ret;

Expand Down Expand Up @@ -1506,7 +1513,7 @@ static int mmc_test_area_io(struct mmc_test_card *test, unsigned long sz,
int timed)
{
return mmc_test_area_io_seq(test, sz, dev_addr, write, max_scatter,
timed, 1, false);
timed, 1, false, 0);
}

/*
Expand Down Expand Up @@ -2084,7 +2091,8 @@ static int mmc_test_large_seq_write_perf(struct mmc_test_card *test)

static int mmc_test_rw_multiple(struct mmc_test_card *test,
struct mmc_test_multiple_rw *tdata,
unsigned int reqsize, unsigned int size)
unsigned int reqsize, unsigned int size,
int min_sg_len)
{
unsigned int dev_addr;
struct mmc_test_area *t = &test->area;
Expand Down Expand Up @@ -2121,7 +2129,7 @@ static int mmc_test_rw_multiple(struct mmc_test_card *test,
/* Run test */
ret = mmc_test_area_io_seq(test, reqsize, dev_addr,
tdata->do_write, 0, 1, size / reqsize,
tdata->do_nonblock_req);
tdata->do_nonblock_req, min_sg_len);
if (ret)
goto err;

Expand All @@ -2146,7 +2154,22 @@ static int mmc_test_rw_multiple_size(struct mmc_test_card *test,
}

for (i = 0 ; i < rw->len && ret == 0; i++) {
ret = mmc_test_rw_multiple(test, rw, rw->bs[i], rw->size);
ret = mmc_test_rw_multiple(test, rw, rw->bs[i], rw->size, 0);
if (ret)
break;
}
return ret;
}

static int mmc_test_rw_multiple_sg_len(struct mmc_test_card *test,
struct mmc_test_multiple_rw *rw)
{
int ret = 0;
int i;

for (i = 0 ; i < rw->len && ret == 0; i++) {
ret = mmc_test_rw_multiple(test, rw, 512*1024, rw->size,
rw->sg_len[i]);
if (ret)
break;
}
Expand Down Expand Up @@ -2229,6 +2252,82 @@ static int mmc_test_profile_mult_read_nonblock_perf(struct mmc_test_card *test)
return mmc_test_rw_multiple_size(test, &test_data);
}

/*
* Multiple blocking write 1 to 512 sg elements
*/
static int mmc_test_profile_sglen_wr_blocking_perf(struct mmc_test_card *test)
{
unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
1 << 7, 1 << 8, 1 << 9};
struct mmc_test_multiple_rw test_data = {
.sg_len = sg_len,
.size = TEST_AREA_MAX_SIZE,
.len = ARRAY_SIZE(sg_len),
.do_write = true,
.do_nonblock_req = false,
.prepare = MMC_TEST_PREP_ERASE,
};

return mmc_test_rw_multiple_sg_len(test, &test_data);
};

/*
* Multiple non-blocking write 1 to 512 sg elements
*/
static int mmc_test_profile_sglen_wr_nonblock_perf(struct mmc_test_card *test)
{
unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
1 << 7, 1 << 8, 1 << 9};
struct mmc_test_multiple_rw test_data = {
.sg_len = sg_len,
.size = TEST_AREA_MAX_SIZE,
.len = ARRAY_SIZE(sg_len),
.do_write = true,
.do_nonblock_req = true,
.prepare = MMC_TEST_PREP_ERASE,
};

return mmc_test_rw_multiple_sg_len(test, &test_data);
}

/*
* Multiple blocking read 1 to 512 sg elements
*/
static int mmc_test_profile_sglen_r_blocking_perf(struct mmc_test_card *test)
{
unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
1 << 7, 1 << 8, 1 << 9};
struct mmc_test_multiple_rw test_data = {
.sg_len = sg_len,
.size = TEST_AREA_MAX_SIZE,
.len = ARRAY_SIZE(sg_len),
.do_write = false,
.do_nonblock_req = false,
.prepare = MMC_TEST_PREP_NONE,
};

return mmc_test_rw_multiple_sg_len(test, &test_data);
}

/*
* Multiple non-blocking read 1 to 512 sg elements
*/
static int mmc_test_profile_sglen_r_nonblock_perf(struct mmc_test_card *test)
{
unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
1 << 7, 1 << 8, 1 << 9};
struct mmc_test_multiple_rw test_data = {
.sg_len = sg_len,
.size = TEST_AREA_MAX_SIZE,
.len = ARRAY_SIZE(sg_len),
.do_write = false,
.do_nonblock_req = true,
.prepare = MMC_TEST_PREP_NONE,
};

return mmc_test_rw_multiple_sg_len(test, &test_data);
}

static const struct mmc_test_case mmc_test_cases[] = {
{
.name = "Basic write (no data verification)",
Expand Down Expand Up @@ -2523,6 +2622,34 @@ static const struct mmc_test_case mmc_test_cases[] = {
.run = mmc_test_profile_mult_read_nonblock_perf,
.cleanup = mmc_test_area_cleanup,
},

{
.name = "Write performance blocking req 1 to 512 sg elems",
.prepare = mmc_test_area_prepare,
.run = mmc_test_profile_sglen_wr_blocking_perf,
.cleanup = mmc_test_area_cleanup,
},

{
.name = "Write performance non-blocking req 1 to 512 sg elems",
.prepare = mmc_test_area_prepare,
.run = mmc_test_profile_sglen_wr_nonblock_perf,
.cleanup = mmc_test_area_cleanup,
},

{
.name = "Read performance blocking req 1 to 512 sg elems",
.prepare = mmc_test_area_prepare,
.run = mmc_test_profile_sglen_r_blocking_perf,
.cleanup = mmc_test_area_cleanup,
},

{
.name = "Read performance non-blocking req 1 to 512 sg elems",
.prepare = mmc_test_area_prepare,
.run = mmc_test_profile_sglen_r_nonblock_perf,
.cleanup = mmc_test_area_cleanup,
},
};

static DEFINE_MUTEX(mmc_test_lock);
Expand Down

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