| To: | Cheng Jin <chengjin@xxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: Linux 2.4.22 loopback question |
| From: | Andi Kleen <ak@xxxxxxx> |
| Date: | Thu, 6 May 2004 08:35:47 +0200 |
| Cc: | netdev@xxxxxxxxxxx |
| In-reply-to: | <Pine.LNX.4.44.0405051440500.14630-100000@fast2.cs.caltech.edu> |
| References: | <Pine.LNX.4.44.0405051440500.14630-100000@fast2.cs.caltech.edu> |
| Sender: | netdev-bounce@xxxxxxxxxxx |
On Wed, May 05, 2004 at 02:53:41PM -0700, Cheng Jin wrote: > I have instrumented the code in net/core/dev.c, and it seems that indeed > the corresponding ack would sometimes be generated by the receiver, > received and timestamped by netif_rx before tcp_transmit_skb returns. Most likely because the network softirq runs in parallel in interrupt context and picks up all the already queued packets. e.g. this can be triggered when you receive a packet from ethernet. -Adni |
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