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max read size


 Hi,

   I was wondering if there is a maximum number of bytes a read system
call services. I see that when I request for a huge number of bytes say
10 million bytes ( read(fd, buffer, 10000000)) it does not read the
requested number of bytes even though the file I am reading is greater
than the request. I executed on 3 different systems and saw that the
maximum number of bytes returned were 132880, 136920, 6080. Where in the
kernel is this max value stored.

 Thanks,
 Raghu.
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