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Bump max number of DNS cached entries from 241 to 4096.

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This may help a little during mass connects.

Also clean up / doxygen the include/dns.h header a bit.
This commit is contained in:
Bram Matthys 2023-05-06 11:13:16 +02:00
parent 8cabbcb59b
commit ef6ba9c0cc
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GPG key ID: BF8116B163EAAE98
1 changed files with 21 additions and 20 deletions

41
include/dns.h
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@ -10,28 +10,30 @@ typedef enum {
typedef struct DNSReq DNSReq;
/* Depending on the request type, some fields are filled in:
* cptr: DNSREQ_CLIENT, DNSREQ_CONNECT
* link: DNSREQ_LINKCONF, DNSREQ_CONNECT
*/
/** DNS Request that is ongoing - used in src/dns.c.
* Depending on the request type, some fields are filled in:
* .client: DNSREQ_CLIENT, DNSREQ_CONNECT
* .link: DNSREQ_LINKCONF, DNSREQ_CONNECT
*/
struct DNSReq {
DNSReq *prev, *next;
char *name; /**< Name being resolved (only for DNSREQ_LINKCONF and DNSREQ_CONNECT) */
char ipv6; /**< Resolving for ipv6 or ipv4? */
DNSReqType type; /**< DNS Request type (DNSREQ_*) */
Client *client; /**< Client the request is for, NULL if client died OR unavailable */
ConfigItem_link *linkblock; /**< Linkblock */
char *name; /**< Name being resolved (only for DNSREQ_LINKCONF and DNSREQ_CONNECT) */
char ipv6; /**< Resolving for ipv6 or ipv4? */
DNSReqType type; /**< DNS Request type (DNSREQ_*) */
Client *client; /**< Client the request is for, NULL if client died OR unavailable */
ConfigItem_link *linkblock; /**< Linkblock */
};
typedef struct DNSCache DNSCache;
/** DNS Cache entry - used in src/dns.c */
struct DNSCache {
DNSCache *prev, *next; /**< Previous and next in linked list */
DNSCache *hprev, *hnext; /**< Previous and next in hash list */
char *name; /**< The hostname */
char *ip; /**< The IP address */
time_t expires; /**< When record expires */
char *name; /**< The hostname */
char *ip; /**< The IP address */
time_t expires; /**< When record expires */
};
typedef struct DNSStats DNSStats;
@ -46,23 +48,22 @@ struct DNSStats {
#define DNS_CACHE_TTL 600
#define DNS_NEGCACHE_TTL 60
/** Size of the hash table (prime!).
* Consumes <this>*4 on ia32 and <this>*4 on 64 bit
* 241 seems a good bet.. which ~1k on ia32 and ~2k on ia64.
*/
#define DNS_HASH_SIZE 241
/** Size of the DNS cache hash table. */
#define DNS_HASH_SIZE 4096
/** Max # of entries we want in our cache.
* This:
* a) prevents us from using too much memory, and
* b) prevents us from keeping useless cache records
*
* A dnscache item is roughly ~80 bytes in size (slightly more on x86),
* so 241*80=~20k, which seems reasonable ;).
* A dnscache item is roughly ~120 bytes in size,
* so 4096*120=480kb, which seems reasonable ;).
*
* Note that in most situations there will be far
* fewer items, as the TTL is rather short.
*/
#define DNS_MAX_ENTRIES DNS_HASH_SIZE
extern ares_channel resolver_channel;
extern void init_resolver(int);