Messages in this thread | | | Date | Wed, 2 Apr 2003 14:47:04 -0800 (PST) | From | Davide Libenzi <> | Subject | Re: loopback behaviour under high load ... |
| |
On Wed, 2 Apr 2003, Martin Josefsson wrote:
> On Wed, 2003-04-02 at 18:23, Davide Libenzi wrote: > > On Tue, 1 Apr 2003, Davide Libenzi wrote: > > > > > And netstat shows Recv-Q=0 for the server socket, and Send-Q=N for the > > > client socket. This has been tested on 2.5.66 vanilla. > > > > An update on this. Kernel 2.4.20+epoll does not have this problem. > > I see something similar with 2.5.64-bk10 (seen with earlier 2.5 kernels > as well). > > I use distcc on my machine which is running 2.5.64-bk10 and using two > remote servers running 2.4.20 to do the compiling. > > Sometimes I see a ~120s stall in the middle of a connection with > Recv-Q=0 on the server (2.4.20) and Send-Q=N on the client (2.5.64-bk10) > (it's the client that's sending data to the server) > > x.x.x.x = client > y.y.y.y = server > > As you can see there's a long delay between 16:02:09 and 16:04:24 > > There's some packetloss here (probably a congested interface in the > router on the way). The dump was made on the client.
Hmm, we don't see any dropped packet at interface ( loopback ) level here:
$ cat /proc/net/softnet_stat 002a0c14 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
$ ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1349417 errors:0 dropped:0 overruns:0 frame:0 TX packets:1349417 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0
- Davide
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |