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test/bdev_perf: disable zcopy by default

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Prior to this patch the bdevperf application enabled using the zcopy API
by default. This means that on bdevs that don't natively support zcopy the
API emulates zero-copy by allocating a buffer. In my test environment, I
measured a 25% decrease in IOPS when zcopy was enabled. This patch changes
the default value so that zcopy is disabled by default. For bdevs that support
zcopy, use the -Z flag to enable using zcopy API.

Change-Id: Ib7e5c24f76eb16ffef038687daca58c0ffad1c1c
Signed-off-by: John Kariuki <John.K.Kariuki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4324
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
John Kariuki 2020-09-18 12:41:57 -07:00 committed by Jim Harris
parent c0bf93145a
commit c5840d77b3
2 changed files with 12 additions and 5 deletions
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7
CHANGELOG.md
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@ -131,6 +131,13 @@ library now no longer exists.
The contents of the bdev_rpc library have been moved to the bdev library. The app_rpc
library now no longer exists.
The bdevperf application now disables the zcopy API by default. Prior to this change,
bdevperf enabled using the zcopy API by default which caused a performance impact of
up to 25% on bdevs that don't natively support zcopy because the API emulates zero-copy
by allocating a buffer. The bdevperf `-x` param was renamed to `-Z` and the default
value changed to false. For bdevs that support zcopy, use the -Z flag to enable
using zcopy API.
### nvmf
Add 'no_wr_batching' parameter to 'spdk_nvmf_transport_opts' struct to disable

10
test/bdev/bdevperf/bdevperf.c
View File

@ -80,7 +80,7 @@ static uint64_t g_show_performance_ema_period = 0;
static int g_run_rc = 0;
static bool g_shutdown = false;
static uint64_t g_shutdown_tsc;
static bool g_zcopy = true;
static bool g_zcopy = false;
static struct spdk_thread *g_master_thread;
static int g_time_in_sec = 0;
static bool g_mix_specified = false;
@ -1929,8 +1929,8 @@ bdevperf_parse_arg(int ch, char *arg)
g_job_bdev_name = optarg;
} else if (ch == 'z') {
g_wait_for_tests = true;
} else if (ch == 'x') {
g_zcopy = false;
} else if (ch == 'Z') {
g_zcopy = true;
} else if (ch == 'A') {
g_abort = true;
} else if (ch == 'C') {
@ -1996,7 +1996,7 @@ bdevperf_usage(void)
printf(" -S <period> show performance result in real time every <period> seconds\n");
printf(" -T <bdev> bdev to run against. Default: all available bdevs.\n");
printf(" -f continue processing I/O even after failures\n");
printf(" -x disable using zcopy bdev API for read or write I/O\n");
printf(" -Z enable using zcopy bdev API for read or write I/O\n");
printf(" -z start bdevperf, but wait for RPC to start tests\n");
printf(" -A abort the timeout I/O\n");
printf(" -C enable every core to send I/Os to each bdev\n");
@ -2112,7 +2112,7 @@ main(int argc, char **argv)
opts.rpc_addr = NULL;
opts.shutdown_cb = spdk_bdevperf_shutdown_cb;
if ((rc = spdk_app_parse_args(argc, argv, &opts, "xzfq:o:t:w:k:ACM:P:S:T:j:", NULL,
if ((rc = spdk_app_parse_args(argc, argv, &opts, "Zzfq:o:t:w:k:ACM:P:S:T:j:", NULL,
bdevperf_parse_arg, bdevperf_usage)) !=
SPDK_APP_PARSE_ARGS_SUCCESS) {
return rc;