Message ID | 1334055402.3126.87.camel@edumazet-glaptop |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Tue, 10 Apr 2012 12:56:42 +0200 > Commit c43b874d5d714f (tcp: properly initialize tcp memory limits) tried > to fix a regression added in commits 4acb4190 & 3dc43e3, > but still get it wrong. > > Result is machines with low amount of memory have too small tcp_rmem[2] > value and slow tcp receives : Per socket limit being 1/1024 of memory > instead of 1/128 in old kernels, so rcv window is capped to small > values. > > Fix this to match comment and previous behavior. > > Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> > Cc: Jason Wang <jasowang@redhat.com> > Cc: Glauber Costa <glommer@parallels.com> Applied and queued up for -stable, thanks Eric. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 5d54ed3..7758a83 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3302,8 +3302,7 @@ void __init tcp_init(void) tcp_init_mem(&init_net); /* Set per-socket limits to no more than 1/128 the pressure threshold */ - limit = nr_free_buffer_pages() << (PAGE_SHIFT - 10); - limit = max(limit, 128UL); + limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7); max_share = min(4UL*1024*1024, limit); sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;
Commit c43b874d5d714f (tcp: properly initialize tcp memory limits) tried to fix a regression added in commits 4acb4190 & 3dc43e3, but still get it wrong. Result is machines with low amount of memory have too small tcp_rmem[2] value and slow tcp receives : Per socket limit being 1/1024 of memory instead of 1/128 in old kernels, so rcv window is capped to small values. Fix this to match comment and previous behavior. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Glauber Costa <glommer@parallels.com> --- v2: remove one useless "limit = max(limit, 128UL);" line net/ipv4/tcp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html