[LU-6402] reduce the value of LDLM_POOL_MAX_AGE

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Affects Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Jian Yu

Description

Currently, LDLM_POOL_MAX_AGE is defined as follows in lustre/ldlm/ldlm_pool.c:

/*
 * Max age for locks on clients.
 */
#define LDLM_POOL_MAX_AGE (36000)

static inline __u64 ldlm_pool_slv_max(__u32 L)
{
        /*
         * Allow to have all locks for 1 client for 10 hrs.
         * Formula is the following: limit * 10h / 1 client.
         */
        __u64 lim = (__u64)L *  LDLM_POOL_MAX_AGE / 1;
        return lim;
}

Andreas suggested to reduce the LRU max age to 4000s (just over 1h, so jobs that write a checkpoint every 1h can re-use their locks) instead of 36000s.

Issue Links

• is related to: LU-14517 Decrease default lru_max_age value
• is related to: LU-17428 reduce default value for lru_max_age to 300s