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Message-ID: <4700B136.8050109@cosmosbay.com> Date: Mon, 01 Oct 2007 10:35:02 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: unlisted-recipients:; (no To-header on input) Cc: Denys <nuclearcat@...learcat.com>, David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression Eric Dumazet a écrit : > Denys a écrit : >> Well, i can play a bit more on "live" servers. I have now hot-swap >> server with >> full gentoo, where i can rebuild any kernel you want, with any >> applied patch. >> But it looks more like not overhead, load becoming high too "spiky", >> and it is >> not just permantenly higher. Also it is not normal that all system >> becoming >> unresposive (for example ping 127.0.0.1 becoming 300ms for period, >> when usage >> softirq jumps to 100%). >> >> > Could you try a pristine 2.6.22.9 and some patch in > secure_tcp_sequence_number() like : > > --- drivers/char/random.c.orig 2007-10-01 10:18:42.000000000 +0200 > +++ drivers/char/random.c 2007-10-01 10:19:58.000000000 +0200 > @@ -1554,7 +1554,7 @@ > * That's funny, Linux has one built in! Use it! > * (Networks are faster now - should this be increased?) > */ > - seq += ktime_get_real().tv64; > + seq += ktime_get_real().tv64 / 1000; > #if 0 > printk("init_seq(%lx, %lx, %d, %d) = %d\n", > saddr, daddr, sport, dport, seq); On 32 bits machine, replace the divide by a shift to avoid a linker error (undefined reference to `__divdi3'): seq += ktime_get_real().tv64 >> 10; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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