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DAOS-18782 cart: Change default mrc settings #18004

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DAOS-18782 cart: Change default mrc settings #18004

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DAOS-18768 cart: Change default mrc settings
frostedcmos Apr 8, 2026
d1eaad2
Merge branch 'release/2.6' into frostedcmos/DAOS-18768-2.6
frostedcmos Apr 14, 2026
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23 changes: 11 additions & 12 deletions src/cart/crt_init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -265,6 +265,7 @@ static int data_init(int server, crt_init_options_t *opt)
unsigned int mrecv_buf = CRT_HG_MRECV_BUF;
unsigned int mrecv_buf_copy = 0; /* buf copy disabled by default */
char *swim_traffic_class = NULL;
uint32_t mrc_enable = 0;
int rc = 0;

crt_env_dump();
Expand Down Expand Up @@ -341,8 +342,17 @@ static int data_init(int server, crt_init_options_t *opt)

/* This is a workaround for CART-871 if universe size is not set */
crt_env_get(FI_UNIVERSE_SIZE, &fi_univ_size);
if (fi_univ_size == 0) {
if (fi_univ_size == 0)
d_setenv("FI_UNIVERSE_SIZE", "2048", 1);

/* Disable MRC on servers and enable on clients by default */
mrc_enable = server ? 0 : 1;
crt_env_get(CRT_MRC_ENABLE, &mrc_enable);

if (mrc_enable == 0) {
D_INFO("Disabling mr caching\n");
d_setenv("FI_MR_CACHE_MAX_COUNT", "0", 1);
d_setenv("UCX_RCACHE_ENABLE", "n", 1);
}

if (credits > CRT_MAX_CREDITS_PER_EP_CTX)
Expand Down Expand Up @@ -592,8 +602,6 @@ file_limit_bump(void)
static void
prov_settings_apply(bool primary, crt_provider_t prov, crt_init_options_t *opt)
{
uint32_t mrc_enable = 0;

/* Avoid applying same settings multiple times */
if (g_prov_settings_applied[prov] == true)
return;
Expand All @@ -619,15 +627,6 @@ prov_settings_apply(bool primary, crt_provider_t prov, crt_init_options_t *opt)
if (prov == CRT_PROV_OFI_TCP || prov == CRT_PROV_OFI_TCP_RXM)
file_limit_bump();

if (prov == CRT_PROV_OFI_CXI)
mrc_enable = 1;

crt_env_get(CRT_MRC_ENABLE, &mrc_enable);
if (mrc_enable == 0) {
D_INFO("Disabling MR CACHE (FI_MR_CACHE_MAX_COUNT=0)\n");
d_setenv("FI_MR_CACHE_MAX_COUNT", "0", 1);
}

g_prov_settings_applied[prov] = true;
}

Expand Down
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