local nntp connections much slower in 2.5.73 than in 2.4.x

local nntp connections much slower in 2.5.73 than in 2.4.x

Post by John Covic » Fri, 04 Jul 2003 19:50:05



Hi.  I have been noticing an nntp problem in my 2.5.73 kernel.  I
have inn 2.3 set up on my machine and I use gnus to read mail and
news.  Now what happens is that when gnus starts up it connects to
the server (same box) and gets all the active newsgroups.  What I
have noticed is a drastic slowdown in 2.5.73 (or other 7x) than in my
2.4.20 kernel and I was wondering if anyone else has seen this or can
tell me either a workaround or what is going on with this.

Thanks.

--
         John Covici

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local nntp connections much slower in 2.5.73 than in 2.4.x

Post by Ring Fa » Fri, 04 Jul 2003 19:50:10



>Hi.  I have been noticing an nntp problem in my 2.5.73 kernel.  I
>have inn 2.3 set up on my machine and I use gnus to read mail and
>news.  Now what happens is that when gnus starts up it connects to
>the server (same box) and gets all the active newsgroups.  What I
>have noticed is a drastic slowdown in 2.5.73 (or other 7x) than in my
>2.4.20 kernel and I was wondering if anyone else has seen this or can
>tell me either a workaround or what is going on with this.

Loopback interface has debugging code in current 2.5.x -

Does this patch speed things up?

diff -urN linux-2.5.66/drivers/net/loopback.c
linux-2.5.66-faster/drivers/net/lo
opback.c
--- linux-2.5.66/drivers/net/loopback.c 2003-03-24 14:00:04.000000000 -0800
+++ linux-2.5.66-faster/drivers/net/loopback.c  2003-04-05
10:15:00.000000000 -0

        /* Current netfilter will die with oom linearizing large skbs,
         * however this will be cured before 2.5.x is done.
-        */
        dev->features          |= NETIF_F_TSO;
+        */

        dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
        if (dev->priv == NULL)

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1. [2.5.73] enable local APIC on P4

The current local APIC code refuses to enable the local APIC
on a P4 if the BIOS booted us with the local APIC disabled.
This patch removes this unnecessary restriction. Please apply.

Most P4 machines do boot with the local APIC enabled, but
Keith Owens reported that the P4 based Compaq Evo N800v
disables the local APIC, even though the machine actually
works if Linux enables it.

It is possible that some P4 machines with broken BIOSen
were saved by our refusal to enable the local APIC. We
can handle them via the DMI blacklist rules instead.

/Mikael

--- linux-2.5.73/arch/i386/kernel/apic.c.~1~    2003-06-17 12:51:19.000000000 +0200

                goto no_apic;
        case X86_VENDOR_INTEL:
                if (boot_cpu_data.x86 == 6 ||
-                   (boot_cpu_data.x86 == 15 && cpu_has_apic) ||
+                   boot_cpu_data.x86 == 15 ||
                    (boot_cpu_data.x86 == 5 && cpu_has_apic))
                        break;
                goto no_apic;
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