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26 lines
981 B
Diff
26 lines
981 B
Diff
NCM tries to batch TX packets using timeouts (500us) and does not send packets
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before 3 packets are in the submit queue. Timeouts take milliseconds on
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dde_linux which leads to delayed ACKs and poor performance for the RX case.
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Therefore, we send small packets (<100 Bytes) immediately without batching (it
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might be an ACK or last packet of a larger transfer).
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diff --git src/linux/drivers/net/usb/cdc_ncm.c src/linux/drivers/net/usb/cdc_ncm.c
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index db05622f1..4ad2bdb17 100644
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--- src/linux/drivers/net/usb/cdc_ncm.c
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+++ src/linux/drivers/net/usb/cdc_ncm.c
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@@ -1356,6 +1356,14 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
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}
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skb_put_data(skb_out, skb->data, skb->len);
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ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
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+
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+ /*
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+ * send small packets immediately (e.g., TCP ACKS), just batch with large
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+ * payloads
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+ */
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+ if (skb->len < 100)
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+ ready2send = 1;
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+
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dev_kfree_skb_any(skb);
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skb = NULL;
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