[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] netback: tx stalls with default credit_bytes
This situation happens when netif->credit_bytes is using the default of ~0UL, effectively -1. Once the current tx packet size is greater than the netif->remaining_credit, transmits will stall until netif->remaining_credit wraps back to ~0UL in tx_add_credit(). The min(netif->remaining_credit + netif->credit_bytes, max_burst) has the effect of decrementing netif->remaining_credit by 1. The min will continually be less than the current tx packet size until tx_add_credit() is called packet size times which allows netif->remaining_credit to wrap back to ~0UL. The patch splits the min() into two steps to eliminate the case of adding by -1. signed-of-by Kirk Allan <kallan@xxxxxxxxxx> Attachment:
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