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Try to make max_dl_per_request a bit smarter

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This commit is contained in:
Nick Mathewson 2014-09-29 10:56:38 -04:00
parent fa80983e52
commit ac9b0a3110
1 changed files with 11 additions and 7 deletions
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18
src/or/routerlist.c
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@ -4358,21 +4358,25 @@ MOCK_IMPL(STATIC void, initiate_descriptor_downloads,
tor_free(resource);
}
/** Max amount of hashes to download per request.
* Since squid does not like URLs >= 4096 bytes we limit it to 96.
* 4096 - strlen(http://255.255.255.255/tor/server/d/.z) == 4058
* 4058/41 (40 for the hash and 1 for the + that separates them) => 98
* So use 96 because it's a nice number.
/** Return the max number of hashes to put in a URL for a given request.
*/
static int
max_dl_per_request(const or_options_t *options, int purpose)
{
/* Since squid does not like URLs >= 4096 bytes we limit it to 96.
* 4096 - strlen(http://255.255.255.255/tor/server/d/.z) == 4058
* 4058/41 (40 for the hash and 1 for the + that separates them) => 98
* So use 96 because it's a nice number.
*/
int max = 96;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
max = 92;
}
if (options->TunnelDirConns) {
max = 1000;
/* If we're going to tunnel our connections, we can ask for a lot more
* in a request. */
if (options->TunnelDirConns &&
!directory_fetches_from_authorities(options)) {
max = 500;
}
return max;
}