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Date:   Sun, 19 May 2019 19:30:07 +0000
From:   Dexuan Cui <>
To:     Sunil Muthuswamy <>,
        KY Srinivasan <>,
        Haiyang Zhang <>,
        Stephen Hemminger <>,
        Sasha Levin <>,
        "David S. Miller" <>,
        Michael Kelley <>
CC:     "" <>,
        "" <>,
        "" <>
Subject: RE: [PATCH] hv_sock: perf: loop in send() to maximize bandwidth

> From: Sunil Muthuswamy <>
> Sent: Thursday, May 16, 2019 7:05 PM
> Currently, the hv_sock send() iterates once over the buffer, puts data into
> the VMBUS channel and returns. It doesn't maximize on the case when there
> is a simultaneous reader draining data from the channel. In such a case,
> the send() can maximize the bandwidth (and consequently minimize the cpu
> cycles) by iterating until the channel is found to be full.
>  ...
> Observation:
> 1. The avg throughput doesn't really change much with this change for this
> scenario. This is most probably because the bottleneck on throughput is
> somewhere else.
> 2. The average system (or kernel) cpu time goes down by 10%+ with this
> change, for the same amount of data transfer.
> Signed-off-by: Sunil Muthuswamy <>

Reviewed-by: Dexuan Cui <>

The patch looks good. Thanks, Sunil!

-- Dexuan

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