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| author | Eric Dumazet <dada1@cosmosbay.com> | 2009-05-19 18:54:22 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-20 17:18:01 -0700 |
| commit | cf8da764fc6959b7efb482f375dfef9830e98205 (patch) | |
| tree | 701e4c42f6563cdb50153485015f0c4b439294ec /net/ipv4/route.c | |
| parent | bc8a5397433e4effbaddfa7e462d10b3c060cabb (diff) | |
| download | linux-stable-cf8da764fc6959b7efb482f375dfef9830e98205.tar.gz linux-stable-cf8da764fc6959b7efb482f375dfef9830e98205.tar.bz2 linux-stable-cf8da764fc6959b7efb482f375dfef9830e98205.zip | |
net: fix length computation in rt_check_expire()
rt_check_expire() computes average and standard deviation of chain lengths,
but not correclty reset length to 0 at beginning of each chain.
This probably gives overflows for sum2 (and sum) on loaded machines instead
of meaningful results.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index c4c60e9f068a..869cf1c44b78 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -785,7 +785,7 @@ static void rt_check_expire(void) static unsigned int rover; unsigned int i = rover, goal; struct rtable *rth, **rthp; - unsigned long length = 0, samples = 0; + unsigned long samples = 0; unsigned long sum = 0, sum2 = 0; u64 mult; @@ -795,9 +795,9 @@ static void rt_check_expire(void) goal = (unsigned int)mult; if (goal > rt_hash_mask) goal = rt_hash_mask + 1; - length = 0; for (; goal > 0; goal--) { unsigned long tmo = ip_rt_gc_timeout; + unsigned long length; i = (i + 1) & rt_hash_mask; rthp = &rt_hash_table[i].chain; @@ -809,6 +809,7 @@ static void rt_check_expire(void) if (*rthp == NULL) continue; + length = 0; spin_lock_bh(rt_hash_lock_addr(i)); while ((rth = *rthp) != NULL) { if (rt_is_expired(rth)) { |